diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index 555ed6ab..b6b5d06e 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -3731,7 +3731,7 @@ void prompt_for_input() {
 		  
       print_string(serial_string);		  
 		  
-      strcpy(callsign, serial_string;
+      strcpy(callsign, serial_string);
       Serial.println("Callsign updated!");	 	  
 /*
 	echo