diff --git a/lib/private/Preview/Storage/ObjectStorePreviewStorage.php b/lib/private/Preview/Storage/ObjectStorePreviewStorage.php
index 0a2f5e8f0122b..037588e72c825 100644
--- a/lib/private/Preview/Storage/ObjectStorePreviewStorage.php
+++ b/lib/private/Preview/Storage/ObjectStorePreviewStorage.php
@@ -56,6 +56,10 @@ public function writePreview(Preview $preview, mixed $stream): int {
 			$store->writeObject($urn, $countStream);
 		} catch (\Exception $exception) {
 			throw new NotPermittedException('Unable to save preview to object store', previous: $exception);
+		} finally {
+			if (is_resource($countStream)) {
+				fclose($countStream);
+			}
 		}
 		return $size;
 	}