diff --git a/src/gui/luainstance.cpp b/src/gui/luainstance.cpp
index 94423a1e5..54bdb4eb2 100644
--- a/src/gui/luainstance.cpp
+++ b/src/gui/luainstance.cpp
@@ -660,8 +660,12 @@ int CLuaInstance::PaintBox(lua_State *L)
 	y = luaL_checkint(L, 3);
 	w = luaL_checkint(L, 4);
 	h = luaL_checkint(L, 5);
+#if HAVE_COOL_HARDWARE
+	c = luaL_checkunsigned(L, 6);
+#else
 	/* luaL_checkint does not like e.g. 0xffcc0000 on powerpc (returns INT_MAX) instead */
 	c = (unsigned int)luaL_checknumber(L, 6);
+#endif
 	if (count > 6)
 		radius = luaL_checkint(L, 7);
 	if (count > 7)
@@ -874,7 +878,11 @@ int CLuaInstance::RenderString(lua_State *L)
 	x = luaL_checkint(L, 4);
 	y = luaL_checkint(L, 5);
 	if (numargs > 5)
+#if HAVE_COOL_HARDWARE
+		c = luaL_checkunsigned(L, 6);
+#else
 		c = luaL_checkint(L, 6);
+#endif
 	if (numargs > 6)
 		w = luaL_checkint(L, 7);
 	else
diff --git a/src/gui/luainstance.h b/src/gui/luainstance.h
index 346177367..ef7006ac3 100644
--- a/src/gui/luainstance.h
+++ b/src/gui/luainstance.h
@@ -34,7 +34,7 @@ extern "C" {
 #include <vector>
 
 #define LUA_API_VERSION_MAJOR 1
-#define LUA_API_VERSION_MINOR 10
+#define LUA_API_VERSION_MINOR 11
 
 /* this is stored as userdata in the lua_State */
 struct CLuaData