diff --git a/Backend/mocked-services/src/main/java/com/r11/tools/controller/MockController.java b/Backend/mocked-services/src/main/java/com/r11/tools/controller/MockController.java
index 38d0bc3..8ec6473 100644
--- a/Backend/mocked-services/src/main/java/com/r11/tools/controller/MockController.java
+++ b/Backend/mocked-services/src/main/java/com/r11/tools/controller/MockController.java
@@ -194,6 +194,7 @@ public class MockController {
         MockedMessageDto mockedMessageDto = klausService.getMockedResponse(clientUUID, mockedResponseId);
         HttpHeaders httpHeaders = new HttpHeaders();
         if (mockedMessageDto.getHttpHeaders() != null) mockedMessageDto.getHttpHeaders().forEach(httpHeaders::set);
+        httpHeaders.add("Content-Type", mockedMessageDto.getMediaType());
         return new ResponseEntity<>(mockedMessageDto.getMessageBody(), httpHeaders,
                 Objects.requireNonNull(HttpStatus.valueOf(mockedMessageDto.getHttpStatus())));
     }