diff --git a/lua.c b/lua.c
index 04e1c660..3c507279 100644
--- a/lua.c
+++ b/lua.c
@@ -272,7 +272,7 @@ luaA_openlib(lua_State *L, const char *name,
     luaL_register(L, name, methods);
 }
 
-static void
+static int
 luaA_font_set(lua_State *L)
 {
     const char *font = luaL_checkstring(L, 1);