diff --git a/tests/test-diffdir b/tests/test-diffdir
--- a/tests/test-diffdir
+++ b/tests/test-diffdir
@@ -7,6 +7,6 @@ hg ci -m "a" -d "0 0"
 
 echo 123 > b
 hg add b
-hg diff | sed "s/\(\(---\|+++\).*\)\t.*/\1/"
+hg diff | sed "s/\(\(---\|+++\) [^ \t]*\)[ \t].*/\1/"
 
-hg diff -r tip | sed "s/\(\(---\|+++\).*\)\t.*/\1/"
+hg diff -r tip | sed "s/\(\(---\|+++\) [^ \t]*\)[ \t].*/\1/"