diff --git a/frontend/drivers/platform_darwin.m b/frontend/drivers/platform_darwin.m
index 2c5a53a8d6..dc265ba968 100644
--- a/frontend/drivers/platform_darwin.m
+++ b/frontend/drivers/platform_darwin.m
@@ -98,6 +98,10 @@ typedef enum
 #endif
 #endif
 
+#ifndef NS_INLINE
+#define NS_INLINE inline
+#endif
+
 NS_INLINE CF_RETURNS_RETAINED CFTypeRef CFBridgingRetainCompat(id X)
 {
 #if __has_feature(objc_arc)