diff --git a/consumer/speed_controller.go b/consumer/speed_controller.go
index 9544fe1..d02e3db 100644
--- a/consumer/speed_controller.go
+++ b/consumer/speed_controller.go
@@ -48,10 +48,9 @@ func (c *fanControl) StartControl() {
 	log.Info("Fan control started")
 
 	ticker := time.Tick(c.sampleDuration)
-	fanSpeedList := make([]int, c.processorCount)
-
+	pastFanSpeedList := make([]int, c.processorCount)
+	newFanSpeedList := make([]int, c.processorCount)
 	for {
-		newFanSpeedList := make([]int, c.processorCount)
 	checker:
 		for {
 			select {
@@ -63,11 +62,11 @@ func (c *fanControl) StartControl() {
 				return
 			}
 		}
-		if (!compareFanSpeed(fanSpeedList, newFanSpeedList)) {
-			copy(fanSpeedList, newFanSpeedList)
+		if (!compareFanSpeed(pastFanSpeedList, newFanSpeedList)) {
+			copy(pastFanSpeedList, newFanSpeedList)
 			args := make([]string, 0)
 			args = append(args, "raw", "0x3a", "0x01", )
-			for _, item := range fanSpeedList {
+			for _, item := range newFanSpeedList {
 				args = append(args, fmt.Sprintf("0x%x", item))
 			}
 			args = append(args,
@@ -89,6 +88,7 @@ func (c *fanControl) StartControl() {
 }
 
 func compareFanSpeed(old, new []int) bool {
+	new = new[:len(old)] // this line is the key
 	for i, v := range old {
 		if v != new[i] { // here is no bounds checking for b[i]
 			return false