diff --git a/src/ca/tcpiiu.cpp b/src/ca/tcpiiu.cpp
index 063bcab4c..a4d40f7bf 100644
--- a/src/ca/tcpiiu.cpp
+++ b/src/ca/tcpiiu.cpp
@@ -850,7 +850,7 @@ void tcpiiu::unresponsiveCircuitNotify (
         {
             epicsGuardRelease < epicsMutex > unguard ( guard );
             {
-                epicsGuardRelease < epicsMutex > unguard ( cbGuard );
+                epicsGuardRelease < epicsMutex > cbUnguard ( cbGuard );
                 this->recvDog.cancel ();
                 this->sendDog.cancel ();
             }
diff --git a/src/ca/udpiiu.cpp b/src/ca/udpiiu.cpp
index e8a59a9a4..0703d012f 100644
--- a/src/ca/udpiiu.cpp
+++ b/src/ca/udpiiu.cpp
@@ -286,7 +286,7 @@ void udpiiu::shutdown (
     {
         epicsGuardRelease < epicsMutex > unguard ( guard );
         {
-            epicsGuardRelease < epicsMutex > unguard ( cbGuard );
+            epicsGuardRelease < epicsMutex > cbUnguard ( cbGuard );
 
             if ( ! this->recvThread.exitWait ( 0.0 ) ) {
                 unsigned tries = 0u;