diff --git a/include/Config/windows.h b/include/Config/windows.h
index 806a90ad240..2ba858104da 100644
--- a/include/Config/windows.h
+++ b/include/Config/windows.h
@@ -11,8 +11,8 @@
  *	on the system).
  */
 
-#ifndef _CONFIG_DLFCN_H
-#define _CONFIG_DLFCN_H
+#ifndef LLVM_CONFIG_WINDOWS_H
+#define LLVM_CONFIG_WINDOWS_H
 
 #include "Config/config.h"
 
diff --git a/include/llvm/Config/windows.h b/include/llvm/Config/windows.h
index 806a90ad240..2ba858104da 100644
--- a/include/llvm/Config/windows.h
+++ b/include/llvm/Config/windows.h
@@ -11,8 +11,8 @@
  *	on the system).
  */
 
-#ifndef _CONFIG_DLFCN_H
-#define _CONFIG_DLFCN_H
+#ifndef LLVM_CONFIG_WINDOWS_H
+#define LLVM_CONFIG_WINDOWS_H
 
 #include "Config/config.h"