diff --git a/src/copy.c b/src/copy.c
index 88df1d4b3..d9f497e9c 100644
--- a/src/copy.c
+++ b/src/copy.c
@@ -273,6 +273,7 @@ copy_reg (const char *src_path, const char *dst_path,
       return_val = false;
       goto close_src_desc;
     }
+  SET_BINARY2 (source_desc, dest_desc);
 
   /* Determine the optimal buffer size.  */