1 files changed, 1 insertions, 1 deletions

diff --git a/src/search.c b/src/search.c
index 7b87a9b996a..2980712213f 100644
--- a/src/search.c
+++ b/src/search.c
@@ -2439,7 +2439,7 @@ since only regular expressions have distinguished subexpressions.  */)
                 {
                   FETCH_STRING_CHAR_ADVANCE_NO_CHECK (c, newtext,
                                                       pos, pos_byte);
-                  if (!buf_multibyte && !SINGLE_BYTE_CHAR_P (c))
+                  if (!buf_multibyte && !ASCII_CHAR_P (c))
                     c = multibyte_char_to_unibyte (c, rev_tbl);
                 }
               else