diff --git a/src/ca/iocinf.h b/src/ca/iocinf.h
index f984effcf..d085fa762 100644
--- a/src/ca/iocinf.h
+++ b/src/ca/iocinf.h
@@ -336,7 +336,6 @@ private:
 enum iiu_conn_state {iiu_connecting, iiu_connected, iiu_disconnected};
 
 extern threadPrivateId cacRecursionLock;
-extern threadPrivateId caClientContextId;
 
 class baseIIU {
 public: