diff --git a/manila/share/drivers/glusterfs/layout_volume.py b/manila/share/drivers/glusterfs/layout_volume.py
index 882fa97c45..e60c252d66 100644
--- a/manila/share/drivers/glusterfs/layout_volume.py
+++ b/manila/share/drivers/glusterfs/layout_volume.py
@@ -435,9 +435,8 @@ class GlusterfsVolumeMappedLayout(layout.GlusterfsShareLayoutBase):
                 gmgr.set_vol_option(USER_MANILA_SHARE, 'NONE')
                 gmgr.set_vol_option('nfs.disable', 'on')
 
-            # When deleting the share instance, we need to
+            # When deleting the share instance, we may need to
             # update'self.gluster_used_vols' again
-            self.gluster_used_vols = set()
             self.gluster_used_vols.add(gmgr.qualified)
             self._push_gluster_vol(gmgr.qualified)
         except exception.GlusterfsException: