diff --git a/src/llama-chat.cpp b/src/llama-chat.cpp
index 0a96a9a579e26..4d6fdf822619b 100644
--- a/src/llama-chat.cpp
+++ b/src/llama-chat.cpp
@@ -16,10 +16,10 @@
 static std::string trim(const std::string & str) {
     size_t start = 0;
     size_t end = str.size();
-    while (start < end && isspace(str[start])) {
+    while (start < end && isspace(static_cast<unsigned char>(str[start]))) {
         start += 1;
     }
-    while (end > start && isspace(str[end - 1])) {
+    while (end > start && isspace(static_cast<unsigned char>(str[end - 1]))) {
         end -= 1;
     }
     return str.substr(start, end - start);