diff --git a/diffscan.c b/diffscan.c
index a696b6ae..8f421e24 100644
--- a/diffscan.c
+++ b/diffscan.c
@@ -278,6 +278,7 @@ static int StartDiffScan(pDiffScan self, pScanData pScan,
   if (status != OKOK) {
     return 0;
   }
+  pCount->pCountInt->lastStatus = HWBusy;
   return 1;
 }
 
@@ -482,6 +483,7 @@ int RunDiffScan(pDiffScan self, pScanData pScan,
   pCount = (pCounter) self->scanObject->pCounterData;
   pCount->pCountInt->Halt(pCount);
   InvokeCallBack(self->scanObject->pCall, SCANEND, self->scanObject);
+  pCount->pCountInt->lastStatus = HWIdle;
 
   return 1;
 }