1 files changed, 4 insertions, 0 deletions

diff --git a/src/lread.c b/src/lread.c
index 7e4ed5272e8..8f990aaeb11 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -2369,6 +2369,10 @@ read1 (readcharfun, pch, first_in_list)
             else
               {
                 p += CHAR_STRING (c, (unsigned char *) p);
+                if (CHAR_BYTE8_P (c))
+                  force_singlebyte = 1;
+                else if (! ASCII_CHAR_P (c))
+                  force_multibyte = 1;
               }
             nchars++;
           }