diff --git a/sky/engine/core/script/dart_init.h b/sky/engine/core/script/dart_init.h
index 8349eaac7cc..1c5895025a3 100644
--- a/sky/engine/core/script/dart_init.h
+++ b/sky/engine/core/script/dart_init.h
@@ -10,7 +10,7 @@
 
 namespace blink {
 
-#define DART_ALLOW_DYNAMIC_RESOLUTION (WTF_OS_IOS || WTF_OS_MACOSX)
+#define DART_ALLOW_DYNAMIC_RESOLUTION OS(IOS)
 
 #if DART_ALLOW_DYNAMIC_RESOLUTION