diff --git a/vncviewer/FTProgress.cxx b/vncviewer/FTProgress.cxx
index 95b4dd4..e43132f 100644
--- a/vncviewer/FTProgress.cxx
+++ b/vncviewer/FTProgress.cxx
@@ -118,10 +118,12 @@
 
   if (m_pSingleProgress != NULL) {
     delete m_pSingleProgress;
+    m_pSingleProgress = NULL;
   }
 
   if (m_pGeneralProgress != NULL) {
     delete m_pGeneralProgress;
+    m_pGeneralProgress = NULL;
   }
 
   return true;