diff --git a/ReactAndroid/src/main/jni/first-party/csslayoutjni/Android.mk b/ReactAndroid/src/main/jni/first-party/csslayoutjni/Android.mk
index da78c7a38..125a7ba9d 100644
--- a/ReactAndroid/src/main/jni/first-party/csslayoutjni/Android.mk
+++ b/ReactAndroid/src/main/jni/first-party/csslayoutjni/Android.mk
@@ -9,7 +9,7 @@ LOCAL_SRC_FILES := \
 
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/jni
 
-LOCAL_CFLAGS += -Wall -Werror -fvisibility=hidden -fexceptions -frtti
+LOCAL_CFLAGS += -Wall -Werror -fvisibility=hidden -fexceptions -frtti -O3
 CXX11_FLAGS := -std=c++11
 LOCAL_CFLAGS += $(CXX11_FLAGS)
 LOCAL_EXPORT_CPPFLAGS := $(CXX11_FLAGS)
diff --git a/ReactCommon/CSSLayout/Android.mk b/ReactCommon/CSSLayout/Android.mk
index 6b29ef6fd..8d9c94559 100644
--- a/ReactCommon/CSSLayout/Android.mk
+++ b/ReactCommon/CSSLayout/Android.mk
@@ -11,6 +11,6 @@ LOCAL_SRC_FILES := \
 LOCAL_C_INCLUDES := $(LOCAL_PATH)
 LOCAL_EXPORT_C_INCLUDES := $(LOCAL_C_INCLUDES)
 
-LOCAL_CFLAGS := -Wall -Werror -fexceptions -frtti -std=c99
+LOCAL_CFLAGS := -Wall -Werror -fexceptions -frtti -std=c99 -O3
 
 include $(BUILD_STATIC_LIBRARY)