1 files changed, 1 insertions, 1 deletions

diff --git a/src/data.c b/src/data.c
index c35efe3067e..2d7ca8e2037 100644
--- a/src/data.c
+++ b/src/data.c
@@ -1955,7 +1955,7 @@ IDX starts at 0.  */)
         args_out_of_range (array, idx);
       CHECK_NUMBER (newelt);
 
-      if (XINT (newelt) < 0 || SINGLE_BYTE_CHAR_P (XINT (newelt)))
+      if (XINT (newelt) < 0 || ASCII_CHAR_P (XINT (newelt)))
         XSTRING (array)->data[idxval] = XINT (newelt);
       else
         {