diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 80e2111..58391b2 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -960,7 +960,7 @@ void LOCK_HARDWARE( struct intel_context *intel )
 				    intel_fb->Base._ColorDrawBufferIndexes[0]);
     }
 
-    if (intel_rb && dPriv->vblFlags &&
+    if (intel_rb && intel_fb->pf_num_pages && dPriv->vblFlags &&
 	!(dPriv->vblFlags & VBLANK_FLAG_NO_IRQ) &&
 	(intel_fb->vbl_waited - intel_rb->vbl_pending) > (1<<23)) {
 	drmVBlank vbl;