1 files changed, 1 insertions, 1 deletions

diff --git a/src/coding.c b/src/coding.c
index 0afe0b3ac42..23ccfbce390 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -6414,7 +6414,7 @@ DEFUN ("find-coding-systems-region-internal",
   Lisp_Object work_table, safe_codings;
   int non_ascii_p = 0;
   int single_byte_char_found = 0;
-  unsigned char *p1, *p1end, *p2, *p2end, *p;
+  const unsigned char *p1, *p1end, *p2, *p2end, *p;
 
   if (STRINGP (start))
     {