diff --git a/http-walker.c b/http-walker.c
index 9c1e5c37e6..fb2d86d5e7 100644
--- a/http-walker.c
+++ b/http-walker.c
@@ -579,8 +579,18 @@ static void cleanup(struct walker *walker)
 	if (data) {
 		alt = data->alt;
 		while (alt) {
+			struct packed_git *pack;
+
 			alt_next = alt->next;
 
+			pack = alt->packs;
+			while (pack) {
+				struct packed_git *pack_next = pack->next;
+				close_pack(pack);
+				free(pack);
+				pack = pack_next;
+			}
+
 			free(alt->base);
 			free(alt);
 
diff --git a/t/t5550-http-fetch-dumb.sh b/t/t5550-http-fetch-dumb.sh
index ea8e48f627..58189c9f7d 100755
--- a/t/t5550-http-fetch-dumb.sh
+++ b/t/t5550-http-fetch-dumb.sh
@@ -4,6 +4,7 @@ test_description='test dumb fetching over http via static file'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 if test_have_prereq !REFFILES