diff --git a/management/univention-directory-listener/src/cache.c b/management/univention-directory-listener/src/cache.c
index 2edd8df733..e4585d9fed 100644
--- a/management/univention-directory-listener/src/cache.c
+++ b/management/univention-directory-listener/src/cache.c
@@ -443,6 +448,8 @@ static inline int cache_update_entry_in_transaction(NotifierID id, char *dn, Cac
 	MDB_txn *write_txn;
 	MDB_val key, data;
 	u_int32_t tmp_size = 0;
+	MDB_env *env;
+	size_t mapsize;
 
 	memset(&data, 0, sizeof(MDB_val));
 	rv = unparse_entry(&data.mv_data, &tmp_size, entry);
@@ -466,6 +473,12 @@ static inline int cache_update_entry_in_transaction(NotifierID id, char *dn, Cac
 	rv = mdb_put(write_txn, id2entry, &key, &data, 0);
 	if (rv != MDB_SUCCESS) {
 		univention_debug(UV_DEBUG_LISTENER, UV_DEBUG_ERROR, "cache_update_entry: storing entry in database failed: %s", dn);
+		if (rv == MDB_MAP_FULL) {
+			univention_debug(UV_DEBUG_LISTENER, UV_DEBUG_ERROR, "cache_update_entry: Please increase the value of the UCR variable listener/cache/mdb/maxsize");
+			env = mdb_txn_env(write_txn);
+			mapsize = mdb_env_get_mapsize(env);
+			univention_debug(UV_DEBUG_LISTENER, UV_DEBUG_ERROR, "cache_update_entry: The current limit of %zu is too small", mapsize);
+		}
 		ERROR_MDB_ABORT(rv, "mdb_put");
 		goto out;
 	}