diff --git a/object-file.c b/object-file.c
index 5f1fa05c4e..50bb5b6ca4 100644
--- a/object-file.c
+++ b/object-file.c

@@ -55,7 +55,6 @@
 	"\x6f\xe1\x41\xf7\x74\x91\x20\xa3\x03\x72" \
 	"\x18\x13"
 
-const struct object_id null_oid;
 static const struct object_id empty_tree_oid = {
 	EMPTY_TREE_SHA1_BIN_LITERAL,
 	GIT_HASH_SHA1,

@@ -64,6 +63,9 @@ static const struct object_id empty_blob_oid = {
 	EMPTY_BLOB_SHA1_BIN_LITERAL,
 	GIT_HASH_SHA1,
 };
+const struct object_id null_oid_sha1 = {
+	{0}, GIT_HASH_SHA1,
+};