From 579e6f76cffd7643ba4002a2c3618a5ea710589a Mon Sep 17 00:00:00 2001
From: Thomas Klausner <wiz@gatalith.at>
Date: Thu, 2 Jul 2026 07:45:10 +0200
Subject: [PATCH] Cast char to unsigned char before passing to isspace (#3574)

---
 src/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.c b/src/main.c
index fb5c7ab8..1ab5dec2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -437,7 +437,7 @@ int main(int argc, char* argv[]) {
           errno = 0;
           long indent = strtol(argv[i+1], &end, 10);
           if (errno || indent < -1 || indent > 7 ||
-              isspace(*argv[i+1]) || end == argv[i+1] || *end) {
+              isspace((unsigned char)*argv[i+1]) || end == argv[i+1] || *end) {
             fprintf(stderr, "jq: --indent takes a number between -1 and 7\n");
             die();
           }