diff --git a/glx/glxscreens.c b/glx/glxscreens.c
index 6f68b066a..2b12049fb 100644
--- a/glx/glxscreens.c
+++ b/glx/glxscreens.c
@@ -254,6 +254,7 @@ AddScreenVisuals(ScreenPtr pScreen, int count, int d)
     VisualPtr	 visuals;
     ColormapPtr	 installedCmap;
     DepthPtr	 depth;
+    int		 rc;
 
     depth = NULL;
     for (i = 0; i < pScreen->numDepths; i++) {
@@ -294,8 +295,10 @@ AddScreenVisuals(ScreenPtr pScreen, int count, int d)
      * for all colormaps.
      */
     for (i = 0; i < numInstalledCmaps; i++) {
-	installedCmap = LookupIDByType (installedCmaps[i], RT_COLORMAP);
-	if (!installedCmap)
+	rc = dixLookupResourceByType((pointer *)&installedCmap,
+				     installedCmaps[i], RT_COLORMAP,
+				     serverClient, DixReadAccess);
+	if (rc != Success)
 	    continue;
 	j = installedCmap->pVisual - pScreen->visuals;
 	installedCmap->pVisual = &visuals[j];
diff --git a/glx/xfont.c b/glx/xfont.c
index 1f4ecbd4d..b8b466d87 100644
--- a/glx/xfont.c
+++ b/glx/xfont.c
@@ -180,12 +180,17 @@ int __glXDisp_UseXFont(__GLXclientState *cl, GLbyte *pc)
     ** Font can actually be either the ID of a font or the ID of a GC
     ** containing a font.
     */
-    pFont = (FontPtr)LookupIDByType(req->font, RT_FONT);
-    if (!pFont) {
-        pGC = (GC *)LookupIDByType(req->font, RT_GC);
-        if (!pGC) {
+
+    error = dixLookupResourceByType((pointer *)&pFont,
+				    req->font, RT_FONT,
+				    client, DixReadAccess);
+    if (error != Success) {
+	error = dixLookupResourceByType((pointer *)&pGC,
+					req->font, RT_GC,
+					client, DixReadAccess);
+        if (error != Success) {
 	    client->errorValue = req->font;
-            return BadFont;
+            return error == BadGC ? BadFont : error;
 	}
 	pFont = pGC->font;
     }