diff --git a/src/mini-journalreader.c b/src/mini-journalreader.c
index 0489d4a..8fccb99 100644
--- a/src/mini-journalreader.c
+++ b/src/mini-journalreader.c
@@ -64,7 +64,7 @@ static void print_error_and_exit(const char *fmt, ...) {
         fprintf(stdout, "], \"error\":\"");
         for (int i = 0; i < message_len; i++) {
             char c = message[i];
-            if (c == '"' || c == '\\' || (c >= 0 && c <= 0x1F)) {
+            if (c == '"' || c == '\\' || c <= 0x1F) {
                 fprintf(stdout, "\\u%04X", c);
             } else {
                 fprintf(stdout, "%c", c);
@@ -216,7 +216,7 @@ static bool print_field(sd_journal *j, const char *field) {
     if (json) {
         char tmp[7];
         for (size_t i = 0; i < l; i++) {
-            if (d[i] == '"' || d[i] == '\\' || (d[i] >= 0 && d[i] <= 0x1F)) {
+            if (d[i] == '"' || d[i] == '\\' || d[i] <= 0x1F) {
                 sprintf(tmp, "\\u%04X", d[i]);
                 print_to_buf(tmp, 6);
             } else {
@@ -305,10 +305,12 @@ int main(int argc, char *argv[]) {
     uint64_t begin = 0;
     uint64_t end = 0;
     char c;
+    int opt = 0;
 
     progname = argv[0];
 
-    while ((c = (char)getopt(argc, argv, "b:e:d:n:f:t:jh")) != -1) {
+    while ((opt = getopt(argc, argv, "b:e:d:n:f:t:jh")) != -1) {
+        c = (char) opt;
         switch (c) {
         case 'b':
             begin = arg_to_uint64(optarg);
diff --git a/debian/changelog b/debian/changelog
index 9cb9914..3575f4f 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+proxmox-mini-journalreader (1.6-1) trixie; urgency=medium
+
+  * fix ERROR: invalid option or missing argument
+
+ -- Wolfgang <github@linux-dude.de>  Sat, 23 Aug 2025 08:46:01 +0200
+
 proxmox-mini-journalreader (1.6) trixie; urgency=medium
 
   * rebuild for Debian 13 "Trixie" based Proxmox releases.