diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index 74ed9de1..799709a2 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -3608,7 +3608,9 @@ void load_files() {
 }
 
 void serial_input() {
-
+	
+  if (!prompt) {  // only query if not in the middle of prompting
+	  
   if (Serial.available() > 0) {  // check for user input on serial port
  
 //    blink(50);
@@ -3708,6 +3710,7 @@ void serial_input() {
     sleep(2.0);		    
    }
  }
+ }
 }
 
 void prompt_for_input() {