diff --git a/src/ca/cac.h b/src/ca/cac.h
index 4bac0cdb1..ae20eef27 100644
--- a/src/ca/cac.h
+++ b/src/ca/cac.h
@@ -266,8 +266,8 @@ private:
     // **** lock hierarchy ****
     // 1) callback lock must always be acquired before
     // the primary mutex if both locks are needed
-    mutable epicsMutex & mutex; 
-    mutable epicsMutex & cbMutex; 
+    epicsMutex & mutex;
+    epicsMutex & cbMutex;
     epicsEvent iiuUninstall;
     ipAddrToAsciiEngine & ipToAEngine;
     epicsTimerQueueActive & timerQueue;
diff --git a/src/ca/udpiiu.h b/src/ca/udpiiu.h
index 0f3d1a313..3c9327547 100644
--- a/src/ca/udpiiu.h
+++ b/src/ca/udpiiu.h
@@ -149,8 +149,8 @@ private:
     double rtteMean;
     double rtteMeanDev;
     cac & cacRef;
-    mutable epicsMutex & cbMutex;
-    mutable epicsMutex & cacMutex;
+    epicsMutex & cbMutex;
+    epicsMutex & cacMutex;
     epics_auto_ptr < epics_auto_ptr < class searchTimer >, eapt_array > ppSearchTmr;
     unsigned nBytesInXmitBuf;
     unsigned nTimers;
diff --git a/src/db/dbCAC.h b/src/db/dbCAC.h
index b25fe301e..3032023dc 100644
--- a/src/db/dbCAC.h
+++ b/src/db/dbCAC.h
@@ -196,8 +196,8 @@ private:
     dbContextReadNotifyCache readNotifyCache;
     dbEventCtx ctx;
     unsigned long stateNotifyCacheSize;
-    mutable epicsMutex & mutex;
-    mutable epicsMutex & cbMutex;
+    epicsMutex & mutex;
+    epicsMutex & cbMutex;
     cacContextNotify & notify;
     epics_auto_ptr < cacContext > pNetContext;
     char * pStateNotifyCache;