diff --git a/src/pybind/rbd/rbd.pyx b/src/pybind/rbd/rbd.pyx
index fd4341ee1a0..ee24d19b4b0 100644
--- a/src/pybind/rbd/rbd.pyx
+++ b/src/pybind/rbd/rbd.pyx
@@ -3441,7 +3441,7 @@ cdef class Image(object):
         with nogil:
             ret = rbd_snap_remove2(self.image, _name, _flags, prog_cb, NULL)
         if ret != 0:
-            raise make_ex(ret, 'error removing snapshot %s from %s with flags %llx' % (name, self.name, flags))
+            raise make_ex(ret, 'error removing snapshot %s from %s with flags %lx' % (name, self.name, flags))
 
     def remove_snap_by_id(self, snap_id):
         """