diff --git a/src/sound/allegro_s.h b/src/sound/allegro_s.h
--- a/src/sound/allegro_s.h
+++ b/src/sound/allegro_s.h
@@ -15,7 +15,7 @@
 #include "sound_driver.hpp"
 
 /** Implementation of the allegro sound driver. */
-class SoundDriver_Allegro: public SoundDriver {
+class SoundDriver_Allegro : public SoundDriver {
 public:
 	/* virtual */ const char *Start(const char * const *param);