diff --git a/tests/test-grep b/tests/test-grep
--- 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