diff --git a/src/ca/disconnectGovernorTimer.cpp b/src/ca/disconnectGovernorTimer.cpp
index 23f3c9f09..e6224b1cd 100644
--- a/src/ca/disconnectGovernorTimer.cpp
+++ b/src/ca/disconnectGovernorTimer.cpp
@@ -53,7 +53,7 @@ void disconnectGovernorTimer::shutdown (
 {
     epicsGuardRelease < epicsMutex > unguard ( guard );
     {
-        epicsGuardRelease < epicsMutex > unguard ( cbGuard );
+        epicsGuardRelease < epicsMutex > cbUnguard ( cbGuard );
         this->timer.cancel ();
     }
     while ( nciu * pChan = this->chanList.get () ) {
diff --git a/src/ca/repeaterSubscribeTimer.cpp b/src/ca/repeaterSubscribeTimer.cpp
index 636d2b71c..5f97965e2 100644
--- a/src/ca/repeaterSubscribeTimer.cpp
+++ b/src/ca/repeaterSubscribeTimer.cpp
@@ -59,7 +59,7 @@ void repeaterSubscribeTimer::shutdown (
 {
     epicsGuardRelease < epicsMutex > unguard ( guard );
     {
-        epicsGuardRelease < epicsMutex > unguard ( cbGuard );
+        epicsGuardRelease < epicsMutex > cbUnguard ( cbGuard );
         this->timer.cancel ();
     }
 }
diff --git a/src/ca/searchTimer.cpp b/src/ca/searchTimer.cpp
index a38e5b2c1..ef1cb6702 100644
--- a/src/ca/searchTimer.cpp
+++ b/src/ca/searchTimer.cpp
@@ -80,7 +80,7 @@ void searchTimer::shutdown (
     {
         epicsGuardRelease < epicsMutex > unguard ( guard );
         {
-            epicsGuardRelease < epicsMutex > unguard ( cbGuard );
+            epicsGuardRelease < epicsMutex > cbUnguard ( cbGuard );
             this->timer.cancel ();
         }
     }