diff --git a/ron.go b/ron.go
index 273345e..b645a2e 100644
--- a/ron.go
+++ b/ron.go
@@ -43,11 +43,10 @@ type (
 )
 
 const (
-	ContentType      string = "Content-Type"
 	HeaderJSON       string = "application/json"
 	HeaderHTML_UTF8  string = "text/html; charset=utf-8"
 	HeaderCSS_UTF8   string = "text/css; charset=utf-8"
-	HeaderJS_UTF8    string = "text/javascript; charset=utf-8"
+	HeaderAppJS      string = "application/javascript"
 	HeaderPlain_UTF8 string = "text/plain; charset=utf-8"
 )
 
@@ -157,7 +156,7 @@ func (g *groupMux) POST(path string, handler func(*Context)) {
 // Calling r.Static("assets", "./folder") will make the contents of the "./folder" directory
 // accessible in the browser at "/assets". For instance, a file located at "./folder/image.png"
 // would be available at "/assets/image.png" in HTML templates.
-func (e *Engine) Static(path, dir string) {
+func (e *Engine) Static(path, dir string) error {
 	if !strings.HasPrefix(path, "/") {
 		path = "/" + path
 	}
@@ -170,12 +169,14 @@ func (e *Engine) Static(path, dir string) {
 
 	if _, err := os.Stat(dir); os.IsNotExist(err) {
 		slog.Error("static directory does not exist", "path", path, "dir", dir)
-		return
+		e.mux.Handle(path, http.NotFoundHandler())
+		return err
 	}
 
 	fs := http.FileServer(http.Dir(dir))
 	e.mux.Handle(path, http.StripPrefix(path, fs))
 	slog.Info("static files served", "path", path, "dir", dir)
+	return nil
 }
 
 func (c *Context) JSON(code int, data any) {
diff --git a/ron_test.go b/ron_test.go
index 50239e6..c59148f 100644
--- a/ron_test.go
+++ b/ron_test.go
@@ -41,7 +41,6 @@ func TestMain(m *testing.M) {
 	f.WriteString("console.log('Hello, World!');")
 	f.Close()
 
-
 	code := m.Run()
 
 	os.RemoveAll("templates")
@@ -328,7 +327,7 @@ func Test_Static(t *testing.T) {
 			givenDirectory: "assets",
 			expectedResponse: testhelpers.ExpectedResponse{
 				Code:   http.StatusOK,
-				Header: HeaderJS_UTF8,
+				Header: HeaderAppJS,
 				Body:   "console.log('Hello, World!');",
 			},
 		},
@@ -342,16 +341,25 @@ func Test_Static(t *testing.T) {
 				Body:   "404 page not found\n",
 			},
 		},
+		"invalid directory": {
+			givenPath:      "assets",
+			givenFile:      "style.css",
+			givenDirectory: "nonexistent",
+			expectedResponse: testhelpers.ExpectedResponse{
+				Code:   http.StatusNotFound,
+				Header: HeaderPlain_UTF8,
+				Body:   "404 page not found\n",
+			},
+		},
 	}
 
 	for name, tt := range tests {
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
-			e := New()
-			e.Static(tt.givenPath, tt.givenDirectory)
-
 			rr := httptest.NewRecorder()
 			req, _ := http.NewRequest("GET", fmt.Sprintf("/%s/%s", tt.givenPath, tt.givenFile), nil)
+			e := New()
+			e.Static(tt.givenPath, tt.givenDirectory)
 			e.ServeHTTP(rr, req)
 
 			testhelpers.VerifyResponse(t, rr, tt.expectedResponse)