diff --git a/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts b/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts
index 83cab4409..92ae1ba39 100644
--- a/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts
+++ b/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts
@@ -201,13 +201,14 @@ export class PdfViewer {
 
         this.fileId = file.fileId;
         this.dossierId = file.dossierId;
+        const filename = file?.filename.includes('.pdf') ? file?.filename : `${file?.filename}.pdf`;
 
         this._logger.info('[PDF] Loading document...');
 
         await this.runWithCleanup(async () => {
             const document = await this.documentViewer.getDocument()?.getPDFDoc();
             await document?.lock();
-            this.#instance.UI.loadDocument(blob, { documentId: file.fileId, filename: file?.filename ?? 'document.pdf', onError });
+            this.#instance.UI.loadDocument(blob, { documentId: file.fileId, filename: filename ?? 'document.pdf', onError });
         });
     }