diff --git a/src/O3DGlideRenderer.m b/src/O3DGlideRenderer.m
index 23a2eb1..fd6ecf7 100644
--- a/src/O3DGlideRenderer.m
+++ b/src/O3DGlideRenderer.m
@@ -54,22 +54,38 @@ sizeToScreenResolution(OFSize size)
 		return GR_RESOLUTION_1600x1200;
 	if (size.width == 400 && size.height == 300)
 		return GR_RESOLUTION_400x300;
+#ifdef GR_RESOLUTION_1152x864
 	if (size.width == 1152 && size.height == 864)
 		return GR_RESOLUTION_1152x864;
+#endif
+#ifdef GR_RESOLUTION_1280x960
 	if (size.width == 1280 && size.height == 960)
 		return GR_RESOLUTION_1280x960;
+#endif
+#ifdef GR_RESOLUTION_1600x1024
 	if (size.width == 1600 && size.height == 1024)
 		return GR_RESOLUTION_1600x1024;
+#endif
+#ifdef GR_RESOLUTION_1792x1344
 	if (size.width == 1792 && size.height == 1344)
 		return GR_RESOLUTION_1792x1344;
+#endif
+#ifdef GR_RESOLUTION_1856x1392
 	if (size.width == 1856 && size.height == 1392)
 		return GR_RESOLUTION_1856x1392;
+#endif
+#ifdef GR_RESOLUTION_1920x1440
 	if (size.width == 1920 && size.height == 1440)
 		return GR_RESOLUTION_1920x1440;
+#endif
+#ifdef GR_RESOLUTION_2048x1536
 	if (size.width == 2048 && size.height == 1536)
 		return GR_RESOLUTION_2048x1536;
+#endif
+#ifdef GR_RESOLUTION_2048x2048
 	if (size.width == 2048 && size.height == 2048)
 		return GR_RESOLUTION_2048x2048;
+#endif
 
 	@throw [OFInvalidArgumentException exception];
 }