diff --git a/hw/vfb/InitOutput.c b/hw/vfb/InitOutput.c
index 48efb61b2..ee8b70667 100644
--- a/hw/vfb/InitOutput.c
+++ b/hw/vfb/InitOutput.c
@@ -187,6 +187,7 @@ freeScreenInfo(vfbScreenInfoPtr pvfb)
 
     case NORMAL_MEMORY_FB:
         free(pvfb->pXWDHeader);
+        pvfb->pXWDHeader = NULL;
         break;
     }
 }