1 files changed, 1 insertions, 1 deletions

diff --git a/src/search.c b/src/search.c
index 94f2b57d6a4..f795eb40abe 100644
--- a/src/search.c
+++ b/src/search.c
@@ -473,7 +473,7 @@ extern Lisp_Object Vascii_downcase_table;
 int
 fast_c_string_match_ignore_case (regexp, string)
      Lisp_Object regexp;
-     char *string;
+     const char *string;
 {
   int val;
   struct re_pattern_buffer *bufp;