diff --git a/git-format-patch.sh b/git-format-patch.sh
index 5b93ff80a0..b43ba3909c 100755
--- a/git-format-patch.sh
+++ b/git-format-patch.sh
@@ -101,7 +101,7 @@ case "$#,$1" in
 	;;
 1,?*..)
 	# single "rev1.." should mean "rev1..HEAD"
-	set x "$1"HEAD"
+	set x "$1"HEAD
 	shift
 	;;
 1,*)