diff --git a/runtime/druntime/src/importc.h b/runtime/druntime/src/importc.h
index 858e502b99..b7b82dbe6b 100644
--- a/runtime/druntime/src/importc.h
+++ b/runtime/druntime/src/importc.h
@@ -41,6 +41,7 @@
 #define __alignof _Alignof
 #define __vector_size__ vector_size
 #define __typeof typeof
+#define __typeof__ typeof
 
 /********************
  * Clang nullability extension used by macOS headers.