diff --git a/basyx.aasrepository/basyx.aasrepository-http/src/main/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryApiHTTPController.java b/basyx.aasrepository/basyx.aasrepository-http/src/main/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryApiHTTPController.java
index 53f79cdc5..58b3c7afb 100644
--- a/basyx.aasrepository/basyx.aasrepository-http/src/main/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryApiHTTPController.java
+++ b/basyx.aasrepository/basyx.aasrepository-http/src/main/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryApiHTTPController.java
@@ -204,7 +204,7 @@ public ResponseEntity<Void> putThumbnailAasRepository(Base64UrlEncodedIdentifier
 			fileInputstream = file.getInputStream();
 			aasRepository.setThumbnail(aasIdentifier.getIdentifier(), fileName, file.getContentType(), fileInputstream);
 			closeInputStream(fileInputstream);
-			return new ResponseEntity<Void>(HttpStatus.OK);
+			return new ResponseEntity<Void>(HttpStatus.NO_CONTENT);
 		} catch (IOException e) {
 			closeInputStream(fileInputstream);
 			return new ResponseEntity<Void>(HttpStatus.INTERNAL_SERVER_ERROR);
diff --git a/basyx.aasrepository/basyx.aasrepository-http/src/test/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryHTTPSuite.java b/basyx.aasrepository/basyx.aasrepository-http/src/test/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryHTTPSuite.java
index 4e8bb589b..1e2238609 100644
--- a/basyx.aasrepository/basyx.aasrepository-http/src/test/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryHTTPSuite.java
+++ b/basyx.aasrepository/basyx.aasrepository-http/src/test/java/org/eclipse/digitaltwin/basyx/aasrepository/http/AasRepositoryHTTPSuite.java
@@ -336,7 +336,7 @@ public void uploadThumbnailToShell() throws IOException {
 		createDummyAasOnServer(getAas1JSONString());
 		CloseableHttpResponse getThumbnailResponse = uploadThumbnail(dummyAasId);
 
-		assertEquals(HttpStatus.OK.value(), getThumbnailResponse.getCode());
+		assertEquals(HttpStatus.NO_CONTENT.value(), getThumbnailResponse.getCode());
 
 		getThumbnailResponse.close();
 	}