1 files changed, 2 insertions, 1 deletions
diff --git a/regex.c b/regex.c
index a9ac0a5c..1d971625 100644
--- a/regex.c
+++ b/regex.c
@@ -597,7 +597,8 @@ static void char_set_add(char_set_t *set, wchar_t ch)
     /* fallthrough */
   case CHSET_SMALL:
     assert (ch < 256);
-    set->s.bitcell[CHAR_SET_INDEX(ch)] |= (1 << CHAR_SET_BIT(ch));
+    set->s.bitcell[CHAR_SET_INDEX(ch)] |=
+      convert(bitcell_t, 1) << CHAR_SET_BIT(ch);
     break;
   case CHSET_LARGE:
     assert (ch < 0x10000);