--- a/src/gkrellmss.h
+++ b/src/gkrellmss.h
@@ -212,7 +212,7 @@
 #define	DRAW_GRID	1
 
 
-SoundMonitor	*gkrellmss;
+extern SoundMonitor *gkrellmss;
 
 
 void		gkrellmss_add_sound_sources(void);