diff --git a/src/glx/dri_glx.c b/src/glx/dri_glx.c
index 0ff53c324f5..f9fe9a25db4 100644
--- a/src/glx/dri_glx.c
+++ b/src/glx/dri_glx.c
@@ -323,6 +323,7 @@ CallCreateNewScreen(Display * dpy, int scrn, __GLXscreenConfigs * psc,
 
    framebuffer.base = MAP_FAILED;
    framebuffer.dev_priv = NULL;
+   framebuffer.size = 0;
 
    if (!XF86DRIOpenConnection(dpy, scrn, &hSAREA, &BusID)) {
       ErrorMessageF("XF86DRIOpenConnection failed\n");