diff --git a/src/cas/generic/caServer.cc b/src/cas/generic/caServer.cc
index 074324fb1..5a174e758 100644
--- a/src/cas/generic/caServer.cc
+++ b/src/cas/generic/caServer.cc
@@ -76,6 +76,7 @@ epicsShareFunc caServer::~caServer()
 {
 	if (this->pCAS) {
 		delete this->pCAS;
+        this->pCAS = NULL;
 	}
 }