diff --git a/lib/Chat/Parser/SystemMessage.php b/lib/Chat/Parser/SystemMessage.php
index d70bb56bfa11..30ceaba620d0 100644
--- a/lib/Chat/Parser/SystemMessage.php
+++ b/lib/Chat/Parser/SystemMessage.php
@@ -800,11 +800,11 @@ protected function getFileFromShare(?Participant $participant, string $shareId):
 			'type' => 'file',
 			'id' => (string) $fileId,
 			'name' => $name,
-			'size' => $size,
+			'size' => (string) $size,
 			'path' => $path,
 			'link' => $url,
 			'etag' => $node->getEtag(),
-			'permissions' => $node->getPermissions(),
+			'permissions' => (string) $node->getPermissions(),
 			'mimetype' => $node->getMimeType(),
 			'preview-available' => $isPreviewAvailable ? 'yes' : 'no',
 		];
@@ -814,8 +814,8 @@ protected function getFileFromShare(?Participant $participant, string $shareId):
 			try {
 				$sizeMetadata = $this->metadataCache->getMetadataPhotosSizeForFileId($fileId);
 				if (isset($sizeMetadata['width'], $sizeMetadata['height'])) {
-					$data['width'] = $sizeMetadata['width'];
-					$data['height'] = $sizeMetadata['height'];
+					$data['width'] = (string) $sizeMetadata['width'];
+					$data['height'] = (string) $sizeMetadata['height'];
 				}
 			} catch (FilesMetadataNotFoundException) {
 			}
diff --git a/src/types/index.ts b/src/types/index.ts
index 02c31e341252..4f40e6e4a80e 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -43,9 +43,9 @@ export type Participant = components['schemas']['Participant']
 export type Mention = RichObject<'server'|'call-type'|'icon-url'>
 export type File = RichObject<'size'|'path'|'link'|'mimetype'|'preview-available'> & {
 	'etag': string,
-	'permissions': number,
-	'width': number,
-	'height': number,
+	'permissions': string,
+	'width': string,
+	'height': string,
 }
 export type ChatMessage = components['schemas']['ChatMessageWithParent']
 export type receiveMessagesParams = ApiOptions<operations['chat-receive-messages']['parameters']['query']>['params']