diff --git a/mediachanger/castorrmc/h/Castor_limits.h b/mediachanger/castorrmc/h/Castor_limits.h
index f1405bda87ba404fbfe035c83a757177b009eb62..52d3eccfb31a679f7484ffcd38f06f5afdb5b890 100644
--- a/mediachanger/castorrmc/h/Castor_limits.h
+++ b/mediachanger/castorrmc/h/Castor_limits.h
@@ -58,6 +58,7 @@
 #define CA_MAXDMPROTNAMELEN 15    /* maximum length for Disk Mover protocol name */
 #define CA_MAXJOBIDLEN     36   /* Maximum length for the representation of the Cuuid */
 #define CA_MAXCSECNAMELEN    512   /* Maximum length for a client or service name */
+#define CA_MAXUSERTAGLEN    63   /* Maximum length for a user tag (stage request) */
 
 /* Max allowed uid/gif */
 #define CA_MAXUID    0x7FFFFFFF /* Maximum uid */