diff --git a/plugins/inputs/socket/socket.go b/plugins/inputs/socket/socket.go
index ab789817a..ab316910d 100644
--- a/plugins/inputs/socket/socket.go
+++ b/plugins/inputs/socket/socket.go
@@ -114,7 +114,7 @@ func (s *Socket) Start() error {
 
 	c.WithDefaults()
 	if err := c.Validate(); err != nil {
-		return fmt.Errorf("Socket input configuration is error! ", err.Error())
+		return fmt.Errorf("Socket input configuration is error: %s ", err.Error())
 	}
 	s.config = c