diff --git a/glx/vndext.c b/glx/vndext.c
index d7936467be5858f1c63d8d5cd4e4fec2a91fd4cc..20c0648ccfc9fc592a552725c0d0fef609db7362 100644
--- a/glx/vndext.c
+++ b/glx/vndext.c
@@ -139,8 +139,17 @@ GlxGetClientData(ClientPtr client)
 {
     GlxClientPriv *cl = xglvGetClientPrivate(client);
     if (cl == NULL) {
-        cl = calloc(1, sizeof(GlxClientPriv));
+        cl = calloc(1, sizeof(GlxClientPriv)
+                + screenInfo.numScreens * sizeof(GlxServerVendor *));
         if (cl != NULL) {
+            int i;
+
+            cl->vendors = (GlxServerVendor **) (cl + 1);
+            for (i=0; i<screenInfo.numScreens; i++)
+            {
+                cl->vendors[i] = GlxGetVendorForScreen(NULL, screenInfo.screens[i]);
+            }
+
             xglvSetClientPrivate(client, cl);
         }
     }
diff --git a/glx/vndserver.h b/glx/vndserver.h
index a175656ae7c22fcc0e4bf74bb9067312fb5ec14a..78246d212cea42f923808852159c973e3b64318d 100644
--- a/glx/vndserver.h
+++ b/glx/vndserver.h
@@ -57,6 +57,11 @@ typedef struct GlxContextTagInfoRec {
 typedef struct GlxClientPrivRec {
     GlxContextTagInfo *contextTags;
     unsigned int contextTagCount;
+
+    /**
+     * The vendor handles for each screen.
+     */
+    GlxServerVendor **vendors;
 } GlxClientPriv;
 
 extern int GlxErrorBase;
diff --git a/glx/vndservermapping.c b/glx/vndservermapping.c
index fd3be92d95c28969291ca0c50a77d49a29007a8e..778656bb6eadcad43afe0e985c14a67eb44402a4 100644
--- a/glx/vndservermapping.c
+++ b/glx/vndservermapping.c
@@ -187,10 +187,21 @@ Bool GlxSetScreenVendor(ScreenPtr screen, GlxServerVendor *vendor)
 
 GlxServerVendor *GlxGetVendorForScreen(ClientPtr client, ScreenPtr screen)
 {
-    GlxScreenPriv *priv = GlxGetScreen(screen);
-    if (priv != NULL) {
-        return priv->vendor;
+    // Note that the client won't be sending GPU screen numbers, so we don't
+    // need per-client mappings for them.
+    if (client != NULL && !screen->isGPU) {
+        GlxClientPriv *cl = GlxGetClientData(client);
+        if (cl != NULL) {
+            return cl->vendors[screen->myNum];
+        } else {
+            return NULL;
+        }
     } else {
-        return NULL;
+        GlxScreenPriv *priv = GlxGetScreen(screen);
+        if (priv != NULL) {
+            return priv->vendor;
+        } else {
+            return NULL;
+        }
     }
 }