diff --git a/aws/cwatch/base.go b/aws/cwatch/base.go
deleted file mode 100644
index ff661a0..0000000
--- a/aws/cwatch/base.go
+++ /dev/null
@@ -1,15 +0,0 @@
-package cwatch
-
-import (
-	"sync"
-
-	"github.com/aws/aws-sdk-go-v2/service/cloudwatch"
-	"github.com/aws/aws-sdk-go-v2/service/cloudwatch/types"
-)
-
-type CWService interface {
-	Queue(d types.MetricDatum)
-	StartQueue(wg *sync.WaitGroup)
-	StopQueue()
-	Prepare(data []types.MetricDatum) *cloudwatch.PutMetricDataInput
-}
diff --git a/aws/cwatch/service.go b/aws/cwatch/service.go
index 613104b..44b1077 100644
--- a/aws/cwatch/service.go
+++ b/aws/cwatch/service.go
@@ -72,4 +72,10 @@ func (s *Service) processBatch(batch []types.MetricDatum) {
 	}
 }
 
+type CWService interface {
+	Queue(d types.MetricDatum)
+	StartQueue(wg *sync.WaitGroup)
+	StopQueue()
+}
+
 var _ CWService = (*Service)(nil)