diff --git a/c/beer-song/src/beer_song.h b/c/beer-song/src/beer_song.h
index 09ea265..01c3b0e 100644
--- a/c/beer-song/src/beer_song.h
+++ b/c/beer-song/src/beer_song.h
@@ -1,3 +1,3 @@
-void verse(char* response, int bottles);
+int verse(char* response, int bottles);
 
 void sing(char *response, int start, int end);