From a6d96c9a142308b7301807438ecfc3ced4b38f14 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 20 Apr 2018 09:32:01 +0530
Subject: [PATCH] Fix #471

---
 kitty/keys.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kitty/keys.c b/kitty/keys.c
index eae62eb5a..1a71a225f 100644
--- a/kitty/keys.c
+++ b/kitty/keys.c
@@ -78,7 +78,11 @@ send_key_to_child(Window *w, int key, int mods, int action) {
 
 static inline bool
 is_ascii_control_char(char c) {
+#if CHAR_MIN == 0
+    return (c <= 31) || c == 127;
+#else
     return (0 <= c && c <= 31) || c == 127;
+#endif
 }
 
 void