diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index c0c3111f5facb..f62842f7d89b2 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -2013,6 +2013,7 @@
     'OC\\Repair\\RepairInvalidShares' => $baseDir . '/lib/private/Repair/RepairInvalidShares.php',
     'OC\\Repair\\RepairLogoDimension' => $baseDir . '/lib/private/Repair/RepairLogoDimension.php',
     'OC\\Repair\\RepairMimeTypes' => $baseDir . '/lib/private/Repair/RepairMimeTypes.php',
+    'OC\\Repair\\TruncateMounts' => $baseDir . '/lib/private/Repair/TruncateMounts.php',
     'OC\\RichObjectStrings\\RichTextFormatter' => $baseDir . '/lib/private/RichObjectStrings/RichTextFormatter.php',
     'OC\\RichObjectStrings\\Validator' => $baseDir . '/lib/private/RichObjectStrings/Validator.php',
     'OC\\Route\\CachingRouter' => $baseDir . '/lib/private/Route/CachingRouter.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 4a35216a172f8..81c1492e23227 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -2054,6 +2054,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Repair\\RepairInvalidShares' => __DIR__ . '/../../..' . '/lib/private/Repair/RepairInvalidShares.php',
         'OC\\Repair\\RepairLogoDimension' => __DIR__ . '/../../..' . '/lib/private/Repair/RepairLogoDimension.php',
         'OC\\Repair\\RepairMimeTypes' => __DIR__ . '/../../..' . '/lib/private/Repair/RepairMimeTypes.php',
+        'OC\\Repair\\TruncateMounts' => __DIR__ . '/../../..' . '/lib/private/Repair/TruncateMounts.php',
         'OC\\RichObjectStrings\\RichTextFormatter' => __DIR__ . '/../../..' . '/lib/private/RichObjectStrings/RichTextFormatter.php',
         'OC\\RichObjectStrings\\Validator' => __DIR__ . '/../../..' . '/lib/private/RichObjectStrings/Validator.php',
         'OC\\Route\\CachingRouter' => __DIR__ . '/../../..' . '/lib/private/Route/CachingRouter.php',
diff --git a/lib/private/Repair.php b/lib/private/Repair.php
index 73f2ae0617818..211ddc5166ebb 100644
--- a/lib/private/Repair.php
+++ b/lib/private/Repair.php
@@ -57,6 +57,7 @@
 use OC\Repair\RepairInvalidShares;
 use OC\Repair\RepairLogoDimension;
 use OC\Repair\RepairMimeTypes;
+use OC\Repair\TruncateMounts;
 use OC\Template\JSCombiner;
 use OCA\DAV\Migration\DeleteSchedulingObjects;
 use OCA\DAV\Migration\RemoveObjectProperties;
@@ -221,6 +222,7 @@ public static function getExpensiveRepairSteps() {
 			),
 			\OCP\Server::get(DeleteSchedulingObjects::class),
 			\OC::$server->get(RemoveObjectProperties::class),
+			\OCP\Server::get(TruncateMounts::class),
 		];
 	}
 
diff --git a/lib/private/Repair/TruncateMounts.php b/lib/private/Repair/TruncateMounts.php
new file mode 100644
index 0000000000000..dee6c08c2b9d6
--- /dev/null
+++ b/lib/private/Repair/TruncateMounts.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\Repair;
+
+use OCP\IDBConnection;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+
+class TruncateMounts implements IRepairStep {
+	public function __construct(
+		private readonly IDBConnection $connection,
+	) {
+	}
+
+	public function getName(): string {
+		return 'Truncate mounts';
+	}
+
+	public function run(IOutput $output): void {
+		$this->connection->truncateTable('mounts', false);
+	}
+}