diff --git a/include/asterisk/strings.h b/include/asterisk/strings.h index 0e2f69ba892578926b4d26199dec504619677e09..2ca75a69c471c65817163aaaf225abb085841882 100644 --- a/include/asterisk/strings.h +++ b/include/asterisk/strings.h @@ -688,7 +688,7 @@ void ast_str_trim_blanks(struct ast_str *buf), if (!buf) { return; } - while (buf->__AST_STR_USED && buf->__AST_STR_STR[buf->__AST_STR_USED - 1] < 33) { + while (buf->__AST_STR_USED && ((unsigned char) buf->__AST_STR_STR[buf->__AST_STR_USED - 1]) < 33) { buf->__AST_STR_STR[--(buf->__AST_STR_USED)] = '\0'; } }