diff --git a/React/CSSLayout/CSSLayout-internal.h b/React/CSSLayout/CSSLayout-internal.h
index 6c13397f7..b55b597c8 100644
--- a/React/CSSLayout/CSSLayout-internal.h
+++ b/React/CSSLayout/CSSLayout-internal.h
@@ -10,9 +10,6 @@
 #ifndef __CSS_LAYOUT_INTERNAL_H
 #define __CSS_LAYOUT_INTERNAL_H
 
-#include <stdio.h>
-#include <stdlib.h>
-
 #include "CSSLayout.h"
 #include "CSSNodeList.h"
 
@@ -43,10 +40,10 @@ typedef struct CSSLayout {
 
   // Instead of recomputing the entire layout every single time, we
   // cache some information to break early when nothing changed
-  int generationCount;
+  uint32_t generationCount;
   CSSDirection lastParentDirection;
 
-  int nextCachedMeasurementsIndex;
+  uint32_t nextCachedMeasurementsIndex;
   CSSCachedMeasurement cachedMeasurements[CSS_MAX_CACHED_RESULT_COUNT];
   float measuredDimensions[2];
 
@@ -86,7 +83,7 @@ typedef struct CSSStyle {
 typedef struct CSSNode {
   CSSStyle style;
   CSSLayout layout;
-  int lineIndex;
+  uint32_t lineIndex;
   bool hasNewLayout;
   bool isTextNode;
   CSSNodeRef parent;
diff --git a/React/CSSLayout/CSSLayout.c b/React/CSSLayout/CSSLayout.c
index 8c280d9fb..8e4f5c96b 100644
--- a/React/CSSLayout/CSSLayout.c
+++ b/React/CSSLayout/CSSLayout.c
@@ -7,10 +7,6 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
-#include <assert.h>
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 
 #include "CSSLayout-internal.h"
@@ -102,7 +98,7 @@ void _CSSNodeMarkDirty(CSSNodeRef node) {
   }
 }
 
-void CSSNodeInsertChild(CSSNodeRef node, CSSNodeRef child, unsigned int index) {
+void CSSNodeInsertChild(CSSNodeRef node, CSSNodeRef child, uint32_t index) {
   CSSNodeListInsert(node->children, child, index);
   child->parent = node;
   _CSSNodeMarkDirty(node);
@@ -114,11 +110,11 @@ void CSSNodeRemoveChild(CSSNodeRef node, CSSNodeRef child) {
   _CSSNodeMarkDirty(node);
 }
 
-CSSNodeRef CSSNodeGetChild(CSSNodeRef node, unsigned int index) {
+CSSNodeRef CSSNodeGetChild(CSSNodeRef node, uint32_t index) {
   return CSSNodeListGet(node->children, index);
 }
 
-unsigned int CSSNodeChildCount(CSSNodeRef node) {
+uint32_t CSSNodeChildCount(CSSNodeRef node) {
   return CSSNodeListCount(node->children);
 }
 
@@ -214,7 +210,7 @@ CSS_NODE_LAYOUT_PROPERTY_IMPL(float, Width, dimensions[CSSDimensionWidth]);
 CSS_NODE_LAYOUT_PROPERTY_IMPL(float, Height, dimensions[CSSDimensionHeight]);
 CSS_NODE_LAYOUT_PROPERTY_IMPL(CSSDirection, Direction, direction);
 
-int gCurrentGenerationCount = 0;
+uint32_t gCurrentGenerationCount = 0;
 
 bool layoutNodeInternal(CSSNode* node, float availableWidth, float availableHeight, CSSDirection parentDirection,
   CSSMeasureMode widthMeasureMode, CSSMeasureMode heightMeasureMode, bool performLayout, char* reason);
@@ -230,8 +226,8 @@ static bool eq(float a, float b) {
   return fabs(a - b) < 0.0001;
 }
 
-static void indent(int n) {
-  for (int i = 0; i < n; ++i) {
+static void indent(uint32_t n) {
+  for (uint32_t i = 0; i < n; ++i) {
     printf("  ");
   }
 }
@@ -259,7 +255,7 @@ static bool four_equal(float four[4]) {
 static void print_css_node_rec(
   CSSNode* node,
   CSSPrintOptions options,
-  int level
+  uint32_t level
 ) {
   indent(level);
   printf("{");
@@ -382,10 +378,10 @@ static void print_css_node_rec(
     print_number_nan("bottom", node->style.position[CSSPositionBottom]);
   }
 
-  unsigned int childCount = CSSNodeListCount(node->children);
+  uint32_t childCount = CSSNodeListCount(node->children);
   if (options & CSSPrintOptionsChildren && childCount > 0) {
     printf("children: [\n");
-    for (unsigned int i = 0; i < childCount; ++i) {
+    for (uint32_t i = 0; i < childCount; ++i) {
       print_css_node_rec(CSSNodeGetChild(node, i), options, level + 1);
     }
     indent(level);
@@ -852,7 +848,7 @@ static void layoutNodeImpl(CSSNode* node, float availableWidth, float availableH
 
   // For nodes with no children, use the available values if they were provided, or
   // the minimum size as indicated by the padding and border sizes.
-  unsigned int childCount = CSSNodeListCount(node->children);
+  uint32_t childCount = CSSNodeListCount(node->children);
   if (childCount == 0) {
     node->layout.measuredDimensions[CSSDimensionWidth] = boundAxis(node, CSSFlexDirectionRow,
       (widthMeasureMode == CSSMeasureModeUndefined || widthMeasureMode == CSSMeasureModeAtMost) ?
@@ -924,7 +920,7 @@ static void layoutNodeImpl(CSSNode* node, float availableWidth, float availableH
 
   // STEP 3: DETERMINE FLEX BASIS FOR EACH ITEM
   CSSNode* child;
-  unsigned int i;
+  uint32_t i;
   float childWidth;
   float childHeight;
   CSSMeasureMode childWidthMeasureMode;
@@ -1031,11 +1027,11 @@ static void layoutNodeImpl(CSSNode* node, float availableWidth, float availableH
   // STEP 4: COLLECT FLEX ITEMS INTO FLEX LINES
 
   // Indexes of children that represent the first and last items in the line.
-  int startOfLineIndex = 0;
-  int endOfLineIndex = 0;
+  uint32_t startOfLineIndex = 0;
+  uint32_t endOfLineIndex = 0;
 
   // Number of lines.
-  int lineCount = 0;
+  uint32_t lineCount = 0;
 
   // Accumulated cross dimensions of all lines so far.
   float totalLineCrossDim = 0;
@@ -1047,7 +1043,7 @@ static void layoutNodeImpl(CSSNode* node, float availableWidth, float availableH
 
     // Number of items on the currently line. May be different than the difference
     // between start and end indicates because we skip over absolute-positioned items.
-    int itemsOnLine = 0;
+    uint32_t itemsOnLine = 0;
 
     // sizeConsumedOnCurrentLine is accumulation of the dimensions and margin
     // of all the children on the current line. This will be used in order to
@@ -1460,10 +1456,10 @@ static void layoutNodeImpl(CSSNode* node, float availableWidth, float availableH
       }
     }
 
-    int endIndex = 0;
+    uint32_t endIndex = 0;
     for (i = 0; i < lineCount; ++i) {
-      int startIndex = endIndex;
-      int j;
+      uint32_t startIndex = endIndex;
+      uint32_t j;
 
       // compute the line's height and find the endIndex
       float lineHeight = 0;
@@ -1654,7 +1650,7 @@ static void layoutNodeImpl(CSSNode* node, float availableWidth, float availableH
   }
 }
 
-int gDepth = 0;
+uint32_t gDepth = 0;
 bool gPrintTree = false;
 bool gPrintChanges = false;
 bool gPrintSkips = false;
@@ -1808,7 +1804,7 @@ bool layoutNodeInternal(CSSNode* node, float availableWidth, float availableHeig
       cachedResults = &layout->cached_layout;
     } else {
       // Try to use the measurement cache.
-      for (int i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
+      for (uint32_t i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
         if (canUseCachedMeasurement(node->isTextNode, availableWidth, availableHeight, marginAxisRow, marginAxisColumn,
             widthMeasureMode, heightMeasureMode, layout->cachedMeasurements[i])) {
           cachedResults = &layout->cachedMeasurements[i];
@@ -1825,7 +1821,7 @@ bool layoutNodeInternal(CSSNode* node, float availableWidth, float availableHeig
       cachedResults = &layout->cached_layout;
     }
   } else {
-    for (int i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
+    for (uint32_t i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
       if (eq(layout->cachedMeasurements[i].availableWidth, availableWidth) &&
           eq(layout->cachedMeasurements[i].availableHeight, availableHeight) &&
           layout->cachedMeasurements[i].widthMeasureMode == widthMeasureMode &&
diff --git a/React/CSSLayout/CSSLayout.h b/React/CSSLayout/CSSLayout.h
index d39c2d90b..24a3d9c3f 100644
--- a/React/CSSLayout/CSSLayout.h
+++ b/React/CSSLayout/CSSLayout.h
@@ -10,7 +10,12 @@
 #ifndef __CSS_LAYOUT_H
 #define __CSS_LAYOUT_H
 
+#include <assert.h>
 #include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
 #ifndef __cplusplus
 #include <stdbool.h>
 #endif
@@ -117,10 +122,10 @@ CSSNodeRef CSSNodeNew();
 void CSSNodeInit(CSSNodeRef node);
 void CSSNodeFree(CSSNodeRef node);
 
-void CSSNodeInsertChild(CSSNodeRef node, CSSNodeRef child, unsigned int index);
+void CSSNodeInsertChild(CSSNodeRef node, CSSNodeRef child, uint32_t index);
 void CSSNodeRemoveChild(CSSNodeRef node, CSSNodeRef child);
-CSSNodeRef CSSNodeGetChild(CSSNodeRef node, unsigned int index);
-unsigned int CSSNodeChildCount(CSSNodeRef node);
+CSSNodeRef CSSNodeGetChild(CSSNodeRef node, uint32_t index);
+uint32_t CSSNodeChildCount(CSSNodeRef node);
 
 void CSSNodeCalculateLayout(
   CSSNodeRef node,
diff --git a/React/CSSLayout/CSSNodeList.c b/React/CSSLayout/CSSNodeList.c
index 4baf95ee3..0daf3421b 100644
--- a/React/CSSLayout/CSSNodeList.c
+++ b/React/CSSLayout/CSSNodeList.c
@@ -7,19 +7,15 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-
 #include "CSSNodeList.h"
 
 struct CSSNodeList {
-  int capacity;
-  int count;
+  uint32_t capacity;
+  uint32_t count;
   void **items;
 };
 
-CSSNodeListRef CSSNodeListNew(unsigned int initialCapacity) {
+CSSNodeListRef CSSNodeListNew(uint32_t initialCapacity) {
   CSSNodeListRef list = malloc(sizeof(struct CSSNodeList));
   assert(list != NULL);
 
@@ -35,7 +31,7 @@ void CSSNodeListFree(CSSNodeListRef list) {
   free(list);
 }
 
-unsigned int CSSNodeListCount(CSSNodeListRef list) {
+uint32_t CSSNodeListCount(CSSNodeListRef list) {
   return list->count;
 }
 
@@ -43,14 +39,14 @@ void CSSNodeListAdd(CSSNodeListRef list, CSSNodeRef node) {
   CSSNodeListInsert(list, node, list->count);
 }
 
-void CSSNodeListInsert(CSSNodeListRef list, CSSNodeRef node, unsigned int index) {
+void CSSNodeListInsert(CSSNodeListRef list, CSSNodeRef node, uint32_t index) {
   if (list->count == list->capacity) {
     list->capacity *= 2;
     list->items = realloc(list->items, sizeof(void*) * list->capacity);
     assert(list->items != NULL);
   }
 
-  for (unsigned int i = list->count; i > index; i--) {
+  for (uint32_t i = list->count; i > index; i--) {
     list->items[i] = list->items[i - 1];
   }
 
@@ -58,11 +54,11 @@ void CSSNodeListInsert(CSSNodeListRef list, CSSNodeRef node, unsigned int index)
   list->items[index] = node;
 }
 
-CSSNodeRef CSSNodeListRemove(CSSNodeListRef list, unsigned int index) {
+CSSNodeRef CSSNodeListRemove(CSSNodeListRef list, uint32_t index) {
   CSSNodeRef removed = list->items[index];
   list->items[index] = NULL;
 
-  for (unsigned int i = index; i < list->count - 1; i++) {
+  for (uint32_t i = index; i < list->count - 1; i++) {
     list->items[i] = list->items[i + 1];
     list->items[i + 1] = NULL;
   }
@@ -72,7 +68,7 @@ CSSNodeRef CSSNodeListRemove(CSSNodeListRef list, unsigned int index) {
 }
 
 CSSNodeRef CSSNodeListDelete(CSSNodeListRef list, CSSNodeRef node) {
-  for (unsigned int i = 0; i < list->count; i++) {
+  for (uint32_t i = 0; i < list->count; i++) {
     if (list->items[i] == node) {
       return CSSNodeListRemove(list, i);
     }
@@ -81,6 +77,6 @@ CSSNodeRef CSSNodeListDelete(CSSNodeListRef list, CSSNodeRef node) {
   return NULL;
 }
 
-CSSNodeRef CSSNodeListGet(CSSNodeListRef list, unsigned int index) {
+CSSNodeRef CSSNodeListGet(CSSNodeListRef list, uint32_t index) {
   return list->items[index];
 }
diff --git a/React/CSSLayout/CSSNodeList.h b/React/CSSLayout/CSSNodeList.h
index e59a30f53..8883c3ec1 100644
--- a/React/CSSLayout/CSSNodeList.h
+++ b/React/CSSLayout/CSSNodeList.h
@@ -10,20 +10,25 @@
 #ifndef __CSS_NODE_LIST_H
 #define __CSS_NODE_LIST_H
 
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
 #include <CSSLayout/CSSLayout.h>
 
 CSS_EXTERN_C_BEGIN
 
 typedef struct CSSNodeList * CSSNodeListRef;
 
-CSSNodeListRef CSSNodeListNew(unsigned int initialCapacity);
+CSSNodeListRef CSSNodeListNew(uint32_t initialCapacity);
 void CSSNodeListFree(CSSNodeListRef list);
-unsigned int CSSNodeListCount(CSSNodeListRef list);
+uint32_t CSSNodeListCount(CSSNodeListRef list);
 void CSSNodeListAdd(CSSNodeListRef list, CSSNodeRef node);
-void CSSNodeListInsert(CSSNodeListRef list, CSSNodeRef node, unsigned int index);
-CSSNodeRef CSSNodeListRemove(CSSNodeListRef list, unsigned int index);
+void CSSNodeListInsert(CSSNodeListRef list, CSSNodeRef node, uint32_t index);
+CSSNodeRef CSSNodeListRemove(CSSNodeListRef list, uint32_t index);
 CSSNodeRef CSSNodeListDelete(CSSNodeListRef list, CSSNodeRef node);
-CSSNodeRef CSSNodeListGet(CSSNodeListRef list, unsigned int index);
+CSSNodeRef CSSNodeListGet(CSSNodeListRef list, uint32_t index);
 
 CSS_EXTERN_C_END