1 files changed, 1 insertions, 1 deletions
diff --git a/refs.h b/refs.h
index 7565decb0f..a79cb13cd9 100644
--- a/refs.h
+++ b/refs.h
@@ -5,7 +5,7 @@
  * Calls the specified function for each ref file until it returns nonzero,
  * and returns the value
  */
-extern int for_each_ref(int (*fn)(const char *path, unsigned char *sha1));
+extern int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1));
 
 /** Reads the refs file specified into sha1 **/
 extern int get_ref_sha1(const char *ref, unsigned char *sha1);