diff --git a/pvAccessApp/remote/blockingServerTCPTransport.cpp b/pvAccessApp/remote/blockingServerTCPTransport.cpp
index 042a2b8..079e2f4 100644
--- a/pvAccessApp/remote/blockingServerTCPTransport.cpp
+++ b/pvAccessApp/remote/blockingServerTCPTransport.cpp
@@ -56,7 +56,7 @@ namespace epics {
 
             errlogSevPrintf(
                     errlogInfo,
-                    "Transport to %s still has %d channel(s) active and closing...",
+                    "Transport to %s still has %u channel(s) active and closing...",
                     ipAddrStr, _channels->size());
 
             map<pvAccessID, ServerChannel*>::iterator it = _channels->begin();