diff --git a/Source/Mac/GTMOAuth2WindowController.h b/Source/Mac/GTMOAuth2WindowController.h
index 9daf11e..5da29f3 100644
--- a/Source/Mac/GTMOAuth2WindowController.h
+++ b/Source/Mac/GTMOAuth2WindowController.h
@@ -67,7 +67,7 @@
 
 #if GTM_INCLUDE_OAUTH2 || !GDATA_REQUIRE_SERVICE_INCLUDES
 
-#include <Foundation/Foundation.h>
+#import <Foundation/Foundation.h>
 
 #if !TARGET_OS_IPHONE