diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
index 336c069c507..060d2bda6ca 100644
--- a/include/llvm/Support/Compiler.h
+++ b/include/llvm/Support/Compiler.h
@@ -201,7 +201,7 @@
 #define LLVM_ATTRIBUTE_WEAK
 #endif
 
-#if __has_attribute(const) || defined(__GNUC__)
+#if __has_attribute(__const__) || defined(__GNUC__)
 // aka 'CONST' but following LLVM Conventions.
 #define LLVM_READNONE __attribute__((__const__))
 #else