diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index 92338ceb..08c1fa54 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -1988,7 +1988,7 @@ void start_ina219() {
 void start_pwm() {
 // based on code https://github.com/rgrosset/pico-pwm-audio
 //
-  Serial.println"Starting pwm!");
+  Serial.println("Starting pwm!");
 	
   pwm_value = 128 - pwm_amplitude;