diff --git a/trunk/rdiff-backup/rdiff_backup/fs_abilities.py b/trunk/rdiff-backup/rdiff_backup/fs_abilities.py
index 7a2b7d2968f9e9df36f61419c4a704eda19f1282..4f7255ea75e0a5dd059e1aa2a0219855457de64f 100644
--- a/trunk/rdiff-backup/rdiff_backup/fs_abilities.py
+++ b/trunk/rdiff-backup/rdiff_backup/fs_abilities.py
@@ -193,7 +193,7 @@ class FSAbilities:
 		assert not self.read_only
 
 		# Make sure ordinary filenames ok
-		ordinary_filename = '5-_ a.'
+		ordinary_filename = '5-_ a.snapshot.gz'
 		ord_rp = subdir.append(ordinary_filename)
 		ord_rp.touch()
 		assert ord_rp.lstat()