diff --git a/src/main.c b/src/main.c
index 5ac758d..73b347a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -445,7 +445,7 @@ int main() {
           break;
         }
 
-        printf("OP %d:%d:%d  VALID   %02d:%02d:%02d %02u.%02u.%02u %u   %u %u %u %u %u \n",
+        printf("OP % 4d:%02d:%02d  VALID   %02d:%02d:%02d %02u.%02u.%02u %u   %u %u %u %u %u \n",
             opTime.hour, opTime.minute, opTime.second,
             clock.hour, clock.minute, clock.second,
             clock.day, clock.month, clock.year, clock.weekday,
@@ -454,7 +454,7 @@ int main() {
         state++;
       } else {
 
-        printf("OP %d:%d:%d  INVALID %02d:%02d:%02d %02u.%02u.%02u %u   %u %u %u \n",
+        printf("OP % 4d:%02d:%02d  INVALID %02d:%02d:%02d %02u.%02u.%02u %u   %u %u %u \n",
             opTime.hour, opTime.minute, opTime.second,
             clock.hour, clock.minute, clock.second,
             clock.day, clock.month, clock.year, clock.weekday,