diff --git a/clang/lib/Headers/hlsl/hlsl_compat_overloads.h b/clang/lib/Headers/hlsl/hlsl_compat_overloads.h
index fe4277ed4a7d2..ee243abef6a41 100644
--- a/clang/lib/Headers/hlsl/hlsl_compat_overloads.h
+++ b/clang/lib/Headers/hlsl/hlsl_compat_overloads.h
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #ifndef _HLSL_COMPAT_OVERLOADS_H_
-#define _HLSl_COMPAT_OVERLOADS_H_
+#define _HLSL_COMPAT_OVERLOADS_H_
 
 namespace hlsl {