--- a/tests/test-grep
+++ b/tests/test-grep
@@ -14,7 +14,7 @@ echo 'import/export' >> port
hg commit -m 2 -u spam -d '2 0'
echo 'import/export' >> port
hg commit -m 3 -u eggs -d '3 0'
-head -3 port > port1
+head -n 3 port > port1
mv port1 port
hg commit -m 4 -u spam -d '4 0'
hg grep port port