diff --git a/pkg/server/middleware/middlewares.go b/pkg/server/middleware/middlewares.go
index e13bee412..65568049e 100644
--- a/pkg/server/middleware/middlewares.go
+++ b/pkg/server/middleware/middlewares.go
@@ -142,9 +142,9 @@ func (b *Builder) buildConstructor(ctx context.Context, middlewareName string) (
 			return nil, badConf
 		}
 
-		qualifiedNames := make([]string, len(config.Chain.Middlewares))
-		for i, name := range config.Chain.Middlewares {
-			qualifiedNames[i] = internal.GetQualifiedName(ctx, name)
+		var qualifiedNames []string
+		for _, name := range config.Chain.Middlewares {
+			qualifiedNames = append(qualifiedNames, internal.GetQualifiedName(ctx, name))
 		}
 		config.Chain.Middlewares = qualifiedNames
 		middleware = func(next http.Handler) (http.Handler, error) {
diff --git a/pkg/server/router/router.go b/pkg/server/router/router.go
index c27d42229..f75a75e49 100644
--- a/pkg/server/router/router.go
+++ b/pkg/server/router/router.go
@@ -143,9 +143,9 @@ func (m *Manager) buildRouterHandler(ctx context.Context, routerName string, rou
 }
 
 func (m *Manager) buildHTTPHandler(ctx context.Context, router *runtime.RouterInfo, routerName string) (http.Handler, error) {
-	qualifiedNames := make([]string, len(router.Middlewares))
-	for i, name := range router.Middlewares {
-		qualifiedNames[i] = internal.GetQualifiedName(ctx, name)
+	var qualifiedNames []string
+	for _, name := range router.Middlewares {
+		qualifiedNames = append(qualifiedNames, internal.GetQualifiedName(ctx, name))
 	}
 	router.Middlewares = qualifiedNames
 	rm := m.modifierBuilder.Build(ctx, qualifiedNames)