diff --git a/src/main.c b/src/main.c
--- a/src/main.c
+++ b/src/main.c
@@ -52,9 +52,10 @@ int main(void)
     uint32_t last_1hz = 0;
     uint32_t last_5hz = 0;
 
+	float duty = 0.0;
+
 	while (1)
 	{
-		float duty = 0.0;
 
 		if(HAL_GetTick() - last_1hz > 750)
 		{
@@ -84,7 +85,7 @@ int main(void)
             last_thermostat = HAL_GetTick();
         }
 
-        pwmout_process(duty);
+        pwmout_process((int16_t)duty);
         display_process();
         watchdog_feed();