diff --git a/glx/glxdri.c b/glx/glxdri.c
index da4646845..a997e2f8a 100644
--- a/glx/glxdri.c
+++ b/glx/glxdri.c
@@ -971,6 +971,8 @@ __glXDRIscreenProbe(ScreenPtr pScreen)
     size_t buffer_size;
     ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
 
+    framebuffer.base = NULL;
+
     if (!xf86LoaderCheckSymbol("DRIQueryDirectRenderingCapable") ||
         !DRIQueryDirectRenderingCapable(pScreen, &isCapable) || !isCapable) {
         LogMessage(X_INFO,