diff --git a/include/dix.h b/include/dix.h
index 2d452d1c7..c1d609a61 100644
--- a/include/dix.h
+++ b/include/dix.h
@@ -640,7 +640,4 @@ typedef struct {
 extern int xstrcasecmp(char *s1, char *s2);
 #endif
 
-/* ffs.c */
-extern int ffs(int i);
-
 #endif /* DIX_H */