diff --git a/src/ca/cac.cpp b/src/ca/cac.cpp
index 1430fe407..bcbf98437 100644
--- a/src/ca/cac.cpp
+++ b/src/ca/cac.cpp
@@ -893,12 +893,10 @@ void cac::lookupChannelAndTransferToTCP ( unsigned cid, unsigned sid,
 
 void cac::uninstallChannel ( nciu & chan )
 {
-    {
-        epicsAutoMutex autoMutex ( this->defaultMutex );
-        nciu *pChan = this->chanTable.remove ( chan );
-        assert ( pChan = &chan );
-        chan.getPIIU ()->detachChannel ( chan );
-    }
+    epicsAutoMutex autoMutex ( this->defaultMutex );
+    nciu *pChan = this->chanTable.remove ( chan );
+    assert ( pChan = &chan );
+    chan.getPIIU ()->detachChannel ( chan );
 }
 
 void cac::getFDRegCallback ( CAFDHANDLER *&fdRegFuncOut, void *&fdRegArgOut ) const
diff --git a/src/ca/netiiu.cpp b/src/ca/netiiu.cpp
index 672d8fd95..4eadcb3d6 100644
--- a/src/ca/netiiu.cpp
+++ b/src/ca/netiiu.cpp
@@ -62,12 +62,10 @@ void netiiu::attachChannel ( nciu &chan )
 // calling this
 void netiiu::detachChannel ( nciu &chan )
 {
-    {
-        epicsAutoMutex autoMutex ( this->mutex );
-        this->channelList.remove ( chan );
-        if ( this->channelList.count () == 0u ) {
-            this->lastChannelDetachNotify ();
-        }
+    epicsAutoMutex autoMutex ( this->mutex );
+    this->channelList.remove ( chan );
+    if ( this->channelList.count () == 0u ) {
+        this->lastChannelDetachNotify ();
     }
 }