diff --git a/googletest/include/gtest/internal/gtest-port-arch.h b/googletest/include/gtest/internal/gtest-port-arch.h
index d3239b25..813bf2c6 100644
--- a/googletest/include/gtest/internal/gtest-port-arch.h
+++ b/googletest/include/gtest/internal/gtest-port-arch.h
@@ -68,6 +68,7 @@
 # define GTEST_OS_OS2 1
 #elif defined __APPLE__
 # define GTEST_OS_MAC 1
+# include <TargetConditionals.h>
 # if TARGET_OS_IPHONE
 #  define GTEST_OS_IOS 1
 # endif