diff --git a/lib/GuestManager.php b/lib/GuestManager.php
index a242704..1ba6911 100644
--- a/lib/GuestManager.php
+++ b/lib/GuestManager.php
@@ -139,7 +139,7 @@ class GuestManager {
 			->from('share')
 			->where($query->expr()->in('share_with', $query->createNamedParameter($guests, IQueryBuilder::PARAM_STR_ARRAY)))
 			->groupBy('share_with');
-		$result = $query->execute();
+		$result = $query->executeQuery();
 		$data = [];
 		while ($row = $result->fetch()) {
 			$data[$row['share_with']] = $row['count'];
diff --git a/lib/UserBackend.php b/lib/UserBackend.php
index 8eff719..70f1072 100644
--- a/lib/UserBackend.php
+++ b/lib/UserBackend.php
@@ -76,7 +76,7 @@ class UserBackend extends ABackend implements
 					'uid_lower' => $qb->createNamedParameter(mb_strtolower($uid)),
 				]);
 
-			$result = $qb->execute();
+			$result = $qb->executeStatement();
 
 			// Clear cache
 			unset($this->cache[$uid]);
@@ -100,7 +100,7 @@ class UserBackend extends ABackend implements
 		$query = $this->dbConn->getQueryBuilder();
 		$query->delete('guests_users')
 			->where($query->expr()->eq('uid_lower', $query->createNamedParameter(mb_strtolower($uid))));
-		$result = $query->execute();
+		$result = $query->executeStatement();
 
 		if (isset($this->cache[$uid])) {
 			unset($this->cache[$uid]);
@@ -128,7 +128,7 @@ class UserBackend extends ABackend implements
 			$query->update('guests_users')
 				->set('password', $query->createNamedParameter($hashedPassword))
 				->where($query->expr()->eq('uid_lower', $query->createNamedParameter(mb_strtolower($uid))));
-			$result = $query->execute();
+			$result = $query->executeStatement();
 
 			return $result ? true : false;
 		}
@@ -179,7 +179,7 @@ class UserBackend extends ABackend implements
 			$query->update('guests_users')
 				->set('displayname', $query->createNamedParameter($displayName))
 				->where($query->expr()->eq('uid_lower', $query->createNamedParameter(mb_strtolower($uid))));
-			$query->execute();
+			$query->executeStatement();
 
 			$this->cache[$uid]['displayname'] = $displayName;
 
@@ -238,7 +238,7 @@ class UserBackend extends ABackend implements
 					->setFirstResult($offset);
 			}
 
-			$result = $query->execute();
+			$result = $query->executeQuery();
 			$displayNames = [];
 			while ($row = $result->fetch()) {
 				$displayNames[(string)$row['uid']] = (string)$row['displayname'];
@@ -269,7 +269,7 @@ class UserBackend extends ABackend implements
 					'uid_lower', $qb->createNamedParameter(mb_strtolower($loginName))
 				)
 			);
-		$result = $qb->execute();
+		$result = $qb->executeQuery();
 		$row = $result->fetch();
 		$result->closeCursor();
 
@@ -310,7 +310,7 @@ class UserBackend extends ABackend implements
 						'uid_lower', $qb->createNamedParameter(mb_strtolower($uid))
 					)
 				);
-			$result = $qb->execute();
+			$result = $qb->executeQuery();
 			$row = $result->fetch();
 			$result->closeCursor();
 
@@ -387,7 +387,7 @@ class UserBackend extends ABackend implements
 		$query = $this->dbConn->getQueryBuilder();
 		$query->select($query->func()->count('uid'))
 			->from('guests_users');
-		$result = $query->execute();
+		$result = $query->executeQuery();
 
 		return $result->fetchColumn();
 	}
diff --git a/tests/unit/UserBackendTest.php b/tests/unit/UserBackendTest.php
index 2f8a20b..5f14fd5 100644
--- a/tests/unit/UserBackendTest.php
+++ b/tests/unit/UserBackendTest.php
@@ -27,7 +27,7 @@ class UserBackendTest extends TestCase {
 	private function clearGuests() {
 		$query = \OC::$server->getDatabaseConnection()->getQueryBuilder();
 
-		$query->delete('guests_users')->execute();
+		$query->delete('guests_users')->executeStatement();
 	}
 
 	protected function setUp(): void {