diff --git a/engine/aggregator.go b/engine/aggregator.go
index eea22d4835..0ef08048f0 100644
--- a/engine/aggregator.go
+++ b/engine/aggregator.go
@@ -104,8 +104,6 @@ type CumulativeArithmeticAggregator struct {
 	defaultValue *protocol.FieldValue
 }
 
-var count int = 0
-
 func (self *CumulativeArithmeticAggregator) AggregatePoint(state interface{}, p *protocol.Point) (interface{}, error) {
 	if state == nil {
 		state = self.initialValue