diff --git a/React/CSSLayout/CSSLayout-internal.h b/React/CSSLayout/CSSLayout-internal.h
index b55b597c8..7ba85c328 100644
--- a/React/CSSLayout/CSSLayout-internal.h
+++ b/React/CSSLayout/CSSLayout-internal.h
@@ -7,8 +7,7 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
-#ifndef __CSS_LAYOUT_INTERNAL_H
-#define __CSS_LAYOUT_INTERNAL_H
+#pragma once
 
 #include "CSSLayout.h"
 #include "CSSNodeList.h"
@@ -98,5 +97,3 @@ typedef struct CSSNode {
 } CSSNode;
 
 CSS_EXTERN_C_END
-
-#endif
diff --git a/React/CSSLayout/CSSLayout.h b/React/CSSLayout/CSSLayout.h
index 24a3d9c3f..9d5af32a0 100644
--- a/React/CSSLayout/CSSLayout.h
+++ b/React/CSSLayout/CSSLayout.h
@@ -7,8 +7,7 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
-#ifndef __CSS_LAYOUT_H
-#define __CSS_LAYOUT_H
+#pragma once
 
 #include <assert.h>
 #include <math.h>
@@ -214,5 +213,3 @@ CSS_NODE_LAYOUT_PROPERTY(float, Height);
 CSS_NODE_LAYOUT_PROPERTY(CSSDirection, Direction);
 
 CSS_EXTERN_C_END
-
-#endif
diff --git a/React/CSSLayout/CSSMacros.h b/React/CSSLayout/CSSMacros.h
index a2fc8e378..1cf88202b 100644
--- a/React/CSSLayout/CSSMacros.h
+++ b/React/CSSLayout/CSSMacros.h
@@ -7,8 +7,7 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
-#ifndef __CSS_MACROS_H
-#define __CSS_MACROS_H
+#pragma once
 
 #ifdef __cplusplus
 # define CSS_EXTERN_C_BEGIN extern "C" {
@@ -17,5 +16,3 @@
 # define CSS_EXTERN_C_BEGIN
 # define CSS_EXTERN_C_END
 #endif
-
-#endif
diff --git a/React/CSSLayout/CSSNodeList.h b/React/CSSLayout/CSSNodeList.h
index 8883c3ec1..d6904efba 100644
--- a/React/CSSLayout/CSSNodeList.h
+++ b/React/CSSLayout/CSSNodeList.h
@@ -7,8 +7,7 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
-#ifndef __CSS_NODE_LIST_H
-#define __CSS_NODE_LIST_H
+#pragma once
 
 #include <assert.h>
 #include <stdlib.h>
@@ -31,5 +30,3 @@ CSSNodeRef CSSNodeListDelete(CSSNodeListRef list, CSSNodeRef node);
 CSSNodeRef CSSNodeListGet(CSSNodeListRef list, uint32_t index);
 
 CSS_EXTERN_C_END
-
-#endif