diff --git a/include/opnmidi.h b/include/opnmidi.h
index a5ec1ca..127db54 100644
--- a/include/opnmidi.h
+++ b/include/opnmidi.h
@@ -28,9 +28,9 @@
 extern "C" {
 #endif
 
-#define OPNMIDI_VERSION_MAJOR 1
-#define OPNMIDI_VERSION_MINOR 1
-#define OPNMIDI_VERSION_PATCHLEVEL 0
+#define OPNMIDI_VERSION_MAJOR       1
+#define OPNMIDI_VERSION_MINOR       1
+#define OPNMIDI_VERSION_PATCHLEVEL  0
 
 #define OPNMIDI_TOSTR(s) #s
 #define OPNMIDI_VERSION \