diff --git a/serial_protocol.c b/serial_protocol.c
index b4db13a..78b7493 100644
--- a/serial_protocol.c
+++ b/serial_protocol.c
@@ -35,6 +35,8 @@ static uint8_t char_counter;
 void status_message(int status_code) {
   if (status_code) {
     switch(status_code) {          
+      case GCSTATUS_OK:
+      printPgmString(PSTR("ok\r\n")); break;
       case GCSTATUS_BAD_NUMBER_FORMAT:
       printPgmString(PSTR("error: Bad number format\n\r")); break;
       case GCSTATUS_EXPECTED_COMMAND_LETTER:
@@ -44,7 +46,9 @@ void status_message(int status_code) {
       case GCSTATUS_FLOATING_POINT_ERROR:
       printPgmString(PSTR("error: Floating point error\n\r")); break;
       default:
-      printPgmString(PSTR("ok\r\n"));      
+      printPgmString(PSTR("error: "));
+      printInteger(status_code);
+      printPgmString(PSTR("\n\r"));
     }
   }
 }