diff --git a/backend/src/operations/Domains.php b/backend/src/operations/Domains.php
index b27a2a2..5e28345 100644
--- a/backend/src/operations/Domains.php
+++ b/backend/src/operations/Domains.php
@@ -239,7 +239,7 @@ class Domains
     public function getDomainType(int $id) : string
     {
         $query = $this->db->prepare('SELECT type FROM domains WHERE id=:id');
-        $query->bindValue(':id', $id);
+        $query->bindValue(':id', $id, \PDO::PARAM_INT);
         $query->execute();
         $record = $query->fetch();
 
@@ -268,8 +268,8 @@ class Domains
         }
 
         $query = $this->db->prepare('UPDATE domains SET master=:master WHERE id=:id');
-        $query->bindValue(':id', $id);
-        $query->bindValue(':master', $master);
+        $query->bindValue(':id', $id, \PDO::PARAM_INT);
+        $query->bindValue(':master', $master, \PDO::PARAM_STR);
         $query->execute();
     }
 }
diff --git a/backend/src/operations/Soa.php b/backend/src/operations/Soa.php
index c02a470..9a42628 100644
--- a/backend/src/operations/Soa.php
+++ b/backend/src/operations/Soa.php
@@ -45,7 +45,7 @@ class Soa
         $this->db->beginTransaction();
 
         $query = $this->db->prepare('SELECT id,name,type FROM domains WHERE id=:id');
-        $query->bindValue(':id', $domainId);
+        $query->bindValue(':id', $domainId, \PDO::PARAM_INT);
         $query->execute();
         $record = $query->fetch();
 
@@ -71,7 +71,7 @@ class Soa
         ];
 
         $query = $this->db->prepare('SELECT content FROM records WHERE domain_id=:id AND type=\'SOA\'');
-        $query->bindValue(':id', $domainId);
+        $query->bindValue(':id', $domainId, \PDO::PARAM_INT);
         $query->execute();
 
         $content = $query->fetch();
@@ -154,7 +154,7 @@ class Soa
     public function updateSerial(int $domainId) : void
     {
         $query = $this->db->prepare('SELECT content FROM records WHERE domain_id=:id AND type=\'SOA\'');
-        $query->bindValue(':id', $domainId);
+        $query->bindValue(':id', $domainId, \PDO::PARAM_INT);
         $query->execute();
         $content = $query->fetch();