diff --git a/yang-models/_3gpp-common-fm.yang b/yang-models/_3gpp-common-fm.yang
index c6b4d33cba5cfe459de19150e7d1781583d4ddec..fc1b0d0f76e58eb1b082566ceaae47d11301881f 100755
--- a/yang-models/_3gpp-common-fm.yang
+++ b/yang-models/_3gpp-common-fm.yang
@@ -115,7 +115,7 @@ module _3gpp-common-fm {
       }
 
       leaf notificationId {
-        type string;
+        type int32;
         config false ;
         mandatory true;
       }