diff --git a/player/lua.c b/player/lua.c
index d147d2c687..791a7d4fea 100644
--- a/player/lua.c
+++ b/player/lua.c
@@ -99,7 +99,7 @@ static int mp_cpcall (lua_State *L, lua_CFunction func, void *ud)
 // pushed to the stack.
 static void mp_lua_optarg(lua_State *L, int arg)
 {
-    while (arg < lua_gettop(L))
+    while (arg > lua_gettop(L))
         lua_pushnil(L);
 }