diff --git a/lib/private/Files/Cache/Storage.php b/lib/private/Files/Cache/Storage.php
index 99b127ab2208e35de07ee00e3849dc9ba848141a..8a076084ac5d9c35800383b2f2e8010ee38e5741 100644
--- a/lib/private/Files/Cache/Storage.php
+++ b/lib/private/Files/Cache/Storage.php
@@ -57,15 +57,15 @@ class Storage {
 		$this->storageId = self::adjustStorageId($this->storageId);
 
 		if ($row = self::getStorageById($this->storageId)) {
-			$this->numericId = $row['numeric_id'];
+			$this->numericId = (int)$row['numeric_id'];
 		} else {
 			$connection = \OC::$server->getDatabaseConnection();
 			$available = $isAvailable ? 1 : 0;
 			if ($connection->insertIfNotExist('*PREFIX*storages', ['id' => $this->storageId, 'available' => $available])) {
-				$this->numericId = $connection->lastInsertId('*PREFIX*storages');
+				$this->numericId = (int)$connection->lastInsertId('*PREFIX*storages');
 			} else {
 				if ($row = self::getStorageById($this->storageId)) {
-					$this->numericId = $row['numeric_id'];
+					$this->numericId = (int)$row['numeric_id'];
 				} else {
 					throw new \RuntimeException('Storage could neither be inserted nor be selected from the database');
 				}
@@ -132,7 +132,7 @@ class Storage {
 		$storageId = self::adjustStorageId($storageId);
 
 		if ($row = self::getStorageById($storageId)) {
-			return $row['numeric_id'];
+			return (int)$row['numeric_id'];
 		} else {
 			return null;
 		}
diff --git a/tests/lib/Repair/RepairLegacyStoragesTest.php b/tests/lib/Repair/RepairLegacyStoragesTest.php
index aa51fe06a3563291c0859ed307067e95b1c20b94..8d8366dde0692d639187f41d8adf58d1c643eb1e 100644
--- a/tests/lib/Repair/RepairLegacyStoragesTest.php
+++ b/tests/lib/Repair/RepairLegacyStoragesTest.php
@@ -98,23 +98,9 @@ class RepairLegacyStoragesTest extends TestCase {
 
 		$storageId = Storage::adjustStorageId($storageId);
 		$numRows = $this->connection->executeUpdate($sql, array($storageId));
-		$this->assertEquals(1, $numRows);
+		$this->assertSame(1, $numRows);
 
-		return \OC::$server->getDatabaseConnection()->lastInsertId('*PREFIX*storages');
-	}
-
-	/**
-	 * Returns the storage id based on the numeric id
-	 *
-	 * @param int $storageId numeric id of the storage
-	 * @return string storage id or null if not found
-	 */
-	private function getStorageId($storageId) {
-		$numericId = Storage::getNumericStorageId($storageId);
-		if (!is_null($numericId)) {
-			return (int)$numericId;
-		}
-		return null;
+		return (int)\OC::$server->getDatabaseConnection()->lastInsertId('*PREFIX*storages');
 	}
 
 	/**
@@ -144,8 +130,8 @@ class RepairLegacyStoragesTest extends TestCase {
 
 		$this->repair->run($this->outputMock);
 
-		$this->assertNull($this->getStorageId($this->legacyStorageId));
-		$this->assertEquals($newStorageNumId, $this->getStorageId($this->newStorageId));
+		$this->assertNull(Storage::getNumericStorageId($this->legacyStorageId));
+		$this->assertSame($newStorageNumId, Storage::getNumericStorageId($this->newStorageId));
 	}
 
 	/**
@@ -163,8 +149,8 @@ class RepairLegacyStoragesTest extends TestCase {
 
 		$this->repair->run($this->outputMock);
 
-		$this->assertNull($this->getStorageId($this->legacyStorageId));
-		$this->assertEquals($legacyStorageNumId, $this->getStorageId($this->newStorageId));
+		$this->assertNull(Storage::getNumericStorageId($this->legacyStorageId));
+		$this->assertSame($legacyStorageNumId, Storage::getNumericStorageId($this->newStorageId));
 	}
 
 	/**
@@ -185,8 +171,8 @@ class RepairLegacyStoragesTest extends TestCase {
 
 		$this->repair->run($this->outputMock);
 
-		$this->assertNull($this->getStorageId($this->legacyStorageId));
-		$this->assertEquals($legacyStorageNumId, $this->getStorageId($this->newStorageId));
+		$this->assertNull(Storage::getNumericStorageId($this->legacyStorageId));
+		$this->assertSame($legacyStorageNumId, Storage::getNumericStorageId($this->newStorageId));
 	}
 
 	/**
@@ -208,8 +194,8 @@ class RepairLegacyStoragesTest extends TestCase {
 
 		$this->repair->run($this->outputMock);
 
-		$this->assertNull($this->getStorageId($this->legacyStorageId));
-		$this->assertEquals($newStorageNumId, $this->getStorageId($this->newStorageId));
+		$this->assertNull(Storage::getNumericStorageId($this->legacyStorageId));
+		$this->assertSame($newStorageNumId, Storage::getNumericStorageId($this->newStorageId));
 	}
 
 	/**
@@ -233,8 +219,8 @@ class RepairLegacyStoragesTest extends TestCase {
 		$this->repair->run($this->outputMock);
 
 		// storages left alone
-		$this->assertEquals($legacyStorageNumId, $this->getStorageId($this->legacyStorageId));
-		$this->assertEquals($newStorageNumId, $this->getStorageId($this->newStorageId));
+		$this->assertSame($legacyStorageNumId, Storage::getNumericStorageId($this->legacyStorageId));
+		$this->assertSame($newStorageNumId, Storage::getNumericStorageId($this->newStorageId));
 
 		// do not set the done flag
 		$this->assertNotEquals('yes', $this->config->getAppValue('core', 'repairlegacystoragesdone'));
@@ -255,7 +241,7 @@ class RepairLegacyStoragesTest extends TestCase {
 
 		$this->repair->run($this->outputMock);
 
-		$this->assertEquals($numId, $this->getStorageId($storageId));
+		$this->assertSame($numId, Storage::getNumericStorageId($storageId));
 	}
 
 	/**
@@ -273,7 +259,7 @@ class RepairLegacyStoragesTest extends TestCase {
 
 		$this->repair->run($this->outputMock);
 
-		$this->assertEquals($numId, $this->getStorageId($storageId));
+		$this->assertSame($numId, Storage::getNumericStorageId($storageId));
 	}
 
 	/**
@@ -291,7 +277,7 @@ class RepairLegacyStoragesTest extends TestCase {
 
 		$this->repair->run($this->outputMock);
 
-		$this->assertEquals($numId, $this->getStorageId($storageId));
+		$this->assertSame($numId, Storage::getNumericStorageId($storageId));
 	}
 
 	/**