diff --git a/lib/Db/Mapper/SignatoryMapper.php b/lib/Db/Mapper/SignatoryMapper.php
index a8f155ce..99ba7c21 100644
--- a/lib/Db/Mapper/SignatoryMapper.php
+++ b/lib/Db/Mapper/SignatoryMapper.php
@@ -34,7 +34,7 @@ public function getSignatories(): array {
 			->from(self::TABLENAME);
 
 		$entities = [];
-		$result = $query->execute();
+		$result = $query->executeQuery();
 		while ($row = $result->fetch()){
 			$entities[] = $this->mapRowToEntity($row);
 		}
@@ -56,7 +56,7 @@ public function getSignatoriesByUser(IUser $user): array {
 			->where($query->expr()->eq('user_id', $query->createNamedParameter($user->getUID())));
 
 		$entities = [];
-		$result = $query->execute();
+		$result = $query->executeQuery();
 		while ($row = $result->fetch()){
 			$entities[] = $this->mapRowToEntity($row);
 		}
@@ -97,7 +97,7 @@ public function updateUserId(string $oldId, string $newId): void {
 			->set('user_id', $query->createNamedParameter($newId))
 			->where($query->expr()->eq('user_id', $query->createNamedParameter($oldId)));
 
-		$query->execute();
+		$query->executeStatement();
 	}
 
 	/**
@@ -108,7 +108,7 @@ public function deleteTerm(Terms $terms) {
 		$query = $this->db->getQueryBuilder();
 		$query->delete(self::TABLENAME)
 			->where($query->expr()->eq('terms_id', $query->createNamedParameter($terms->getId())));
-		$query->execute();
+		$query->executeStatement();
 	}
 
 	/**
@@ -117,7 +117,7 @@ public function deleteTerm(Terms $terms) {
 	public function deleteAllSignatories() {
 		$query = $this->db->getQueryBuilder();
 		$query->delete(self::TABLENAME);
-		$query->execute();
+		$query->executeStatement();
 	}
 
 	/**
@@ -128,6 +128,6 @@ public function deleteSignatoriesByUser(IUser $user) {
 		$query = $this->db->getQueryBuilder();
 		$query->delete(self::TABLENAME)
 			->where($query->expr()->eq('user_id', $query->createNamedParameter($user->getUID())));
-		$query->execute();
+		$query->executeStatement();
 	}
 }
diff --git a/lib/Db/Mapper/TermsMapper.php b/lib/Db/Mapper/TermsMapper.php
index 262e1acd..7824cb70 100644
--- a/lib/Db/Mapper/TermsMapper.php
+++ b/lib/Db/Mapper/TermsMapper.php
@@ -40,7 +40,7 @@ public function getTermsForCountryCode(string $countryCode): array {
 			$countryCode => [],
 		];
 
-		$result = $query->execute();
+		$result = $query->executeQuery();
 		while ($row = $result->fetch()){
 			$entities[$row['country_code']][] = $this->mapRowToEntity($row);
 		}
@@ -68,7 +68,7 @@ public function getTermsForCountryCodeAndLanguageCode(string $countryCode, strin
 			->from(self::TABLENAME)
 			->where($query->expr()->eq('country_code', $query->createNamedParameter($countryCode)))
 			->andWhere($query->expr()->eq('language_code', $query->createNamedParameter($languageCode)));
-		$result = $query->execute();
+		$result = $query->executeQuery();
 		$row = $result->fetch();
 		$result->closeCursor();
 
@@ -89,7 +89,7 @@ public function getTerms(): array {
 			->from(self::TABLENAME);
 
 		$entities = [];
-		$result = $query->execute();
+		$result = $query->executeQuery();
 		while ($row = $result->fetch()){
 			$entities[$row['id']] = $this->mapRowToEntity($row);
 		}
diff --git a/lib/Migration/Version1000Date20181122140802.php b/lib/Migration/Version1000Date20181122140802.php
index 1f04c68d..554e7cd1 100644
--- a/lib/Migration/Version1000Date20181122140802.php
+++ b/lib/Migration/Version1000Date20181122140802.php
@@ -73,13 +73,13 @@ public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array
 		$query->select('*')
 			->from('termsofservice_signatories');
 
-		$result = $query->execute();
+		$result = $query->executeQuery();
 		while ($row = $result->fetch()) {
 			$insert
 				->setParameter('terms_id', (int) $row['terms_id'], IQueryBuilder::PARAM_INT)
 				->setParameter('user_id', $row['user_id'])
 				->setParameter('timestamp', (int) $row['timestamp'], IQueryBuilder::PARAM_INT);
-			$insert->execute();
+			$insert->executeStatement();
 		}
 		$result->closeCursor();
 	}