diff --git a/wdm.go b/wdm.go
index 809036c..be6d1d2 100644
--- a/wdm.go
+++ b/wdm.go
@@ -708,6 +708,7 @@ func updateItemBHandler(writer http.ResponseWriter, req *http.Request) {
 // Upload Funktionen
 func uploadFileHandler(writer http.ResponseWriter, req *http.Request) {
 	writer.Header().Set("Access-Control-Allow-Origin", "*")
+	writer.Header().Set("Content-Type", "image/*")
 	if req.Method == http.MethodOptions {
 		return
 	}