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-rw-r--r--tree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tree.c b/tree.c
index aa55ddb684..2432f09a02 100644
--- a/tree.c
+++ b/tree.c
@@ -73,7 +73,7 @@ int read_tree(void *buffer, unsigned long size, int stage)
return read_tree_recursive(buffer, size, "", 0, stage);
}
-struct tree *lookup_tree(unsigned char *sha1)
+struct tree *lookup_tree(const unsigned char *sha1)
{
struct object *obj = lookup_object(sha1);
if (!obj) {