1 files changed, 3 insertions, 1 deletions
diff --git a/mbyte.c b/mbyte.c
index bb773cfa..c0c0fa7e 100644
--- a/mbyte.c
+++ b/mbyte.c
@@ -289,13 +289,15 @@ static int iswupper_ucs (wint_t x)
 {
   /* Only works for x < 0x130 */
   if ((0x60 < x && x < 0x7b) || (0xe0 <= x && x < 0xff && x != 0xf7))
+    return 0;
+  else if ((0x40 < x && x < 0x5b) || 0xbf < x && x < 0xde)
     return 1;
   else if (0x100 <= x && x < 0x130)
     return 1;
   else if (x == 0xb5)
     return 1;
   else if (x == 0xff)
-    return 1;
+    return 0;
   else
     return 0;
 }