From 0cd87bc8c1012b331f2cc1c954517c98588db78c Mon Sep 17 00:00:00 2001
From: frosch <frosch@openttd.org>
Date: Sat, 15 Mar 2025 18:48:26 +0100
Subject: [PATCH] Fix: Don't add chars with unspecified signedness to pointers.
 (#13828)

---
 src/strings.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/strings.cpp b/src/strings.cpp
index 6530c29560..84496630d0 100644
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -1227,7 +1227,7 @@ static void FormatString(StringBuilder &builder, const char *str_arg, StringPara
 							break;
 						}
 						/* Otherwise skip to the next case */
-						str += 3 + (str[1] << 8) + str[2];
+						str += 3 + (static_cast<uint8_t>(str[1]) << 8) + static_cast<uint8_t>(str[2]);
 						num--;
 					}
 					break;