https://github.com/ImageMagick/ImageMagick/issues/194
diff --git a/MagickCore/accelerate-private.h b/MagickCore/accelerate-private.h
index bd2b6c5..46c1c97 100644
--- a/MagickCore/accelerate-private.h
+++ b/MagickCore/accelerate-private.h
@@ -16,8 +16,8 @@
   MagickCore private methods for accelerated functions.
 */
 
-#ifndef _MAGICKCORE_ACCELERATE_PRIVATE_H
-#define _MAGICKCORE_ACCELERATE_PRIVATE_H
+#ifndef MAGICKCORE_ACCELERATE_PRIVATE_H
+#define MAGICKCORE_ACCELERATE_PRIVATE_H
 
 #include "MagickCore/fx.h"
 #include "MagickCore/morphology.h"
@@ -63,4 +63,4 @@
 }
 #endif
 
-#endif // _MAGICKCORE_ACCELERATE_PRIVATE_H
+#endif // MAGICKCORE_ACCELERATE_PRIVATE_H