diff --git a/src/half.h b/src/half.h
index 1a9ffa4..8f79290 100644
--- a/src/half.h
+++ b/src/half.h
@@ -5,11 +5,7 @@
 
 #include <float.h>
 
-#if defined(__is_identifier)
-#if __is_identifier(__Float16)
-#define FLT16_SUPPORT
-#endif
-#elif defined(FLT16_MAX)
+#ifdef __FLT16_MAX__
 #define FLT16_SUPPORT
 #endif