diff --git a/src/db/dbPutNotifyBlocker.cpp b/src/db/dbPutNotifyBlocker.cpp
index d76b47faf..2e63d91e6 100644
--- a/src/db/dbPutNotifyBlocker.cpp
+++ b/src/db/dbPutNotifyBlocker.cpp
@@ -43,9 +43,10 @@
 #include "dbChannelIO.h"
 #include "dbPutNotifyBlocker.h"
 
-epicsSingleton < tsFreeList < dbPutNotifyBlocker, 1024 > > dbPutNotifyBlocker::pFreeList;
+epicsSingleton < tsFreeList < dbPutNotifyBlocker, 1024 > > 
+                                    dbPutNotifyBlocker::pFreeList;
 
-dbPutNotifyBlocker::dbPutNotifyBlocker ( dbChannelIO &chanIn ) :
+dbPutNotifyBlocker::dbPutNotifyBlocker () :
     pNotify ( 0 ), maxValueSize ( sizeof ( this->dbrScalarValue ) )
 {
     memset ( & this->pn, '\0', sizeof ( this->pn ) );
diff --git a/src/db/dbPutNotifyBlocker.h b/src/db/dbPutNotifyBlocker.h
index ee4a73776..dc897eef1 100644
--- a/src/db/dbPutNotifyBlocker.h
+++ b/src/db/dbPutNotifyBlocker.h
@@ -45,7 +45,7 @@
 
 class dbPutNotifyBlocker : public dbBaseIO {
 public:
-    dbPutNotifyBlocker ( dbChannelIO & chanIn );
+    dbPutNotifyBlocker ();
     void initiatePutNotify ( epicsGuard < epicsMutex > & locker, 
             cacWriteNotify & notify, struct dbAddr & addr, 
             unsigned type, unsigned long count, const void * pValue );
diff --git a/src/db/dbServiceIO.cpp b/src/db/dbServiceIO.cpp
index 1aa5ac90a..c2c5d69d6 100644
--- a/src/db/dbServiceIO.cpp
+++ b/src/db/dbServiceIO.cpp
@@ -195,7 +195,7 @@ void dbServiceIO::initiatePutNotify (
 {
     epicsGuard < epicsMutex > locker ( this->mutex );
     if ( ! chan.dbServicePrivateListOfIO::pBlocker ) {
-        chan.dbServicePrivateListOfIO::pBlocker = new dbPutNotifyBlocker ( chan );
+        chan.dbServicePrivateListOfIO::pBlocker = new dbPutNotifyBlocker ();
         this->ioTable.add ( *chan.dbServicePrivateListOfIO::pBlocker );
     }
     chan.dbServicePrivateListOfIO::pBlocker->initiatePutNotify (