diff --git a/src/luaconsole.c b/src/luaconsole.c
index a6d60ade8..b89e125ca 100644
--- a/src/luaconsole.c
+++ b/src/luaconsole.c
@@ -805,16 +805,16 @@ int luacon_graphics_update(int t, int i, int *pixel_mode, int *cola, int *colr,
 	lua_pushinteger(l, *colb);
 	lua_pcall(l, 4, 10, 0);
 
-	cache = luaL_optint(l, 2, 0);
-	*pixel_mode = luaL_optint(l, 3, *pixel_mode);
-	*cola = luaL_optint(l, 4, *cola);
-	*colr = luaL_optint(l, 5, *colr);
-	*colg = luaL_optint(l, 6, *colg);
-	*colb = luaL_optint(l, 7, *colb);
-	*firea = luaL_optint(l, 8, *firea);
-	*firer = luaL_optint(l, 9, *firer);
-	*fireg = luaL_optint(l, 10, *fireg);
-	*fireb = luaL_optint(l, 11, *fireb);
+	cache = luaL_optint(l, -10, 0);
+	*pixel_mode = luaL_optint(l, -9, *pixel_mode);
+	*cola = luaL_optint(l, -8, *cola);
+	*colr = luaL_optint(l, -7, *colr);
+	*colg = luaL_optint(l, -6, *colg);
+	*colb = luaL_optint(l, -5, *colb);
+	*firea = luaL_optint(l, -4, *firea);
+	*firer = luaL_optint(l, -3, *firer);
+	*fireg = luaL_optint(l, -2, *fireg);
+	*fireb = luaL_optint(l, -1, *fireb);
 	lua_pop(l, 10);
 	return cache;
 }