diff --git a/src/index.c b/src/index.c
index bff5d7f..860adaf 100644
--- a/src/index.c
+++ b/src/index.c
@@ -2661,8 +2661,7 @@
 
 	if (last) {
 		path += git_encode_varint((unsigned char *) path,
-					  disk_size,
-					  path_len - same_len);
+					  disk_size, same_len);
 	}
 	memcpy(path, path_start, path_len);