diff --git a/glx/glxcmds.c b/glx/glxcmds.c
index d2e739325..e21f0f098 100644
--- a/glx/glxcmds.c
+++ b/glx/glxcmds.c
@@ -144,7 +144,7 @@ validGlxContext(ClientPtr client, XID id, int access_mode,
 {
     *err = dixLookupResourceByType((pointer *) context, id,
 				   __glXContextRes, client, access_mode);
-    if (err != Success) {
+    if (*err != Success) {
 	client->errorValue = id;
 	if (*err == BadValue)
 	    *err = __glXError(GLXBadContext);