diff --git a/pkg/etcd/etcd.go b/pkg/etcd/etcd.go
index d1997caa5c1..6be650dc25d 100644
--- a/pkg/etcd/etcd.go
+++ b/pkg/etcd/etcd.go
@@ -136,7 +136,7 @@ type membershipError struct {
 }
 
 func (e *membershipError) Error() string {
-	return fmt.Sprintf("this server is a not a member of the etcd cluster. Found %v, expect: %s", e.members, e.self)
+	return fmt.Sprintf("this server is not a member of the etcd cluster. Found %v, expect: %s", e.members, e.self)
 }
 
 func (e *membershipError) Is(target error) bool {