diff --git a/broker/http_broker.go b/broker/http_broker.go
index 2ad8ed0a..98abac97 100644
--- a/broker/http_broker.go
+++ b/broker/http_broker.go
@@ -286,7 +286,7 @@ func (h *httpBroker) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 
 	b, err := ioutil.ReadAll(req.Body)
 	if err != nil {
-		errr := errors.InternalServerError("go.micro.broker", fmt.Sprintf("Error reading request body: %v", err))
+		errr := errors.InternalServerError("go.micro.broker", "Error reading request body: %v", err)
 		w.WriteHeader(500)
 		w.Write([]byte(errr.Error()))
 		return
@@ -294,7 +294,7 @@ func (h *httpBroker) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 
 	var m *Message
 	if err = h.opts.Codec.Unmarshal(b, &m); err != nil {
-		errr := errors.InternalServerError("go.micro.broker", fmt.Sprintf("Error parsing request body: %v", err))
+		errr := errors.InternalServerError("go.micro.broker", "Error parsing request body: %v", err)
 		w.WriteHeader(500)
 		w.Write([]byte(errr.Error()))
 		return
diff --git a/client/rpc_client.go b/client/rpc_client.go
index cc4078bd..aa157bad 100644
--- a/client/rpc_client.go
+++ b/client/rpc_client.go
@@ -78,7 +78,7 @@ func (r *rpcClient) call(ctx context.Context, address string, req Request, resp
 	var grr error
 	c, err := r.pool.getConn(address, r.opts.Transport, transport.WithTimeout(opts.DialTimeout))
 	if err != nil {
-		return errors.InternalServerError("go.micro.client", fmt.Sprintf("connection error: %v", err))
+		return errors.InternalServerError("go.micro.client", "connection error: %v", err)
 	}
 	defer func() {
 		// defer execution of release
@@ -98,7 +98,7 @@ func (r *rpcClient) call(ctx context.Context, address string, req Request, resp
 	go func() {
 		defer func() {
 			if r := recover(); r != nil {
-				ch <- errors.InternalServerError("go.micro.client", fmt.Sprintf("panic recovered: %v", r))
+				ch <- errors.InternalServerError("go.micro.client", "panic recovered: %v", r)
 			}
 		}()
 
@@ -154,7 +154,7 @@ func (r *rpcClient) stream(ctx context.Context, address string, req Request, opt
 
 	c, err := r.opts.Transport.Dial(address, transport.WithStream(), transport.WithTimeout(opts.DialTimeout))
 	if err != nil {
-		return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("connection error: %v", err))
+		return nil, errors.InternalServerError("go.micro.client", "connection error: %v", err)
 	}
 
 	stream := &rpcStream{