diff --git a/projects/common/src/fm/services/item.service.ts b/projects/common/src/fm/services/item.service.ts
index 2cdb88c..ebaebb4 100644
--- a/projects/common/src/fm/services/item.service.ts
+++ b/projects/common/src/fm/services/item.service.ts
@@ -63,7 +63,7 @@ export class ItemService {
 
   getItemData(code: string,start?:number,size?:number): Observable<ArrayBuffer> {
     var headers = new HttpHeaders();
-    if(start && size) headers=headers.append("Range",`bytes=${start}-${size-1}`);
+    if(start && size) headers=headers.set("Range",`bytes=${start}-${size-1}`);
     return this.httpClient.get(`${this.ApiEndpoint()}/api/v1/items/${code}/data`,{ headers: headers,responseType: 'arraybuffer' });
   }