diff --git a/src/music/null_m.h b/src/music/null_m.h
--- a/src/music/null_m.h
+++ b/src/music/null_m.h
@@ -15,7 +15,7 @@
 #include "music_driver.hpp"
 
 /** The music player that does nothing. */
-class MusicDriver_Null: public MusicDriver {
+class MusicDriver_Null : public MusicDriver {
 public:
 	/* virtual */ const char *Start(const char * const *param) { return NULL; }