diff --git a/http.c b/http.c
index 94e1afdee7..0031b3a939 100644
--- a/http.c
+++ b/http.c
@@ -1157,7 +1157,7 @@ static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 	int ret;
 
 	if (has_pack_index(sha1)) {
-		new_pack = parse_pack_index(sha1, NULL);
+		new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
 		if (!new_pack)
 			return -1; /* parse_pack_index() already issued error message */
 		goto add_pack;
diff --git a/t/t5550-http-fetch-dumb.sh b/t/t5550-http-fetch-dumb.sh
index 1a3a2b6c1a..c3ba7ed0fe 100755
--- a/t/t5550-http-fetch-dumb.sh
+++ b/t/t5550-http-fetch-dumb.sh
@@ -165,6 +165,24 @@ test_expect_success 'fetch notices corrupt idx' '
 	)
 '
 
+test_expect_success 'fetch can handle previously-fetched .idx files' '
+	git checkout --orphan branch1 &&
+	echo base >file &&
+	git add file &&
+	git commit -m base &&
+	git --bare init "$HTTPD_DOCUMENT_ROOT_PATH"/repo_packed_branches.git &&
+	git push "$HTTPD_DOCUMENT_ROOT_PATH"/repo_packed_branches.git branch1 &&
+	git --git-dir="$HTTPD_DOCUMENT_ROOT_PATH"/repo_packed_branches.git repack -d &&
+	git checkout -b branch2 branch1 &&
+	echo b2 >>file &&
+	git commit -a -m b2 &&
+	git push "$HTTPD_DOCUMENT_ROOT_PATH"/repo_packed_branches.git branch2 &&
+	git --git-dir="$HTTPD_DOCUMENT_ROOT_PATH"/repo_packed_branches.git repack -d &&
+	git --bare init clone_packed_branches.git &&
+	git --git-dir=clone_packed_branches.git fetch "$HTTPD_URL"/dumb/repo_packed_branches.git branch1:branch1 &&
+	git --git-dir=clone_packed_branches.git fetch "$HTTPD_URL"/dumb/repo_packed_branches.git branch2:branch2
+'
+
 test_expect_success 'did not use upload-pack service' '
 	grep '/git-upload-pack' <"$HTTPD_ROOT_PATH"/access.log >act
 	: >exp