diff --git a/src/storage/storage_backend_rbd.c b/src/storage/storage_backend_rbd.c
index 7615dcc37f42ba4a1221108a2973848b8b7f2ee1..bacf0b86384b9c63925f543611c8ea1dcc0a12ab 100644
--- a/src/storage/storage_backend_rbd.c
+++ b/src/storage/storage_backend_rbd.c
@@ -145,7 +145,7 @@ static int virStorageBackendRBDOpenRADOSConn(virStorageBackendRBDStatePtr *ptr,
                               pool->def->source.hosts[i].name,
                               pool->def->source.hosts[i].port);
         } else {
-            virStorageReportError(VIR_ERR_INTERNAL_ERROR,
+            virStorageReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                   _("received malformed monitor, check the XML definition"));
         }
     }