diff --git a/upload-pack.c b/upload-pack.c
index 5dc8e1f..1006beb 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -321,6 +321,7 @@
 	pack_objects.in = -1;
 	pack_objects.out = -1;
 	pack_objects.err = -1;
+	pack_objects.clean_on_exit = 1;
 
 	if (start_command(&pack_objects))
 		die("git upload-pack: unable to fork git-pack-objects");