diff --git a/controller/controller.ino b/controller/controller.ino
index e20fe73e9207425d476df4d4981d70885534199c..cff462adb0192d1e5f00c306289ec191b2bef85a 100644
--- a/controller/controller.ino
+++ b/controller/controller.ino
@@ -139,7 +139,7 @@ void loop() {
     if (gMode == "SERIAL" and Serial.available()) {
 
         float input = Serial.parseFloat();
-        if (input == 0) {
+        if (input <= 0) {
             StopMotor(gEsc_val);
         } else {
             gEsc_val = FreqToEsc(input);