diff --git a/flix/motors.ino b/flix/motors.ino
index 6b808b1..959a951 100644
--- a/flix/motors.ino
+++ b/flix/motors.ino
@@ -7,7 +7,7 @@
 
 float motors[4]; // normalized motor thrusts in range [0..1]
 
-int motorPins[4] = {12, 13, 14, 15}; // default pin numbers
+int motorPins[4] = {-1, -1, -1, -1}; // default pin numbers
 int pwmFrequency = 78000;
 int pwmResolution = 10;
 int pwmStop = 0;