diff --git a/core/database.php b/core/database.php
index a38dd178..5a5a40cb 100644
--- a/core/database.php
+++ b/core/database.php
@@ -87,7 +87,6 @@ class Database
         $db_params = [
             PDO::ATTR_PERSISTENT => $ka,
             PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
-            PDO::ATTR_EMULATE_PREPARES => false,  # return native types
         ];
         $this->db = new PDO(DATABASE_DSN, $db_user, $db_pass, $db_params);
 
diff --git a/core/imageboard/image.php b/core/imageboard/image.php
index c757e334..4ad9ae75 100644
--- a/core/imageboard/image.php
+++ b/core/imageboard/image.php
@@ -81,9 +81,13 @@ class Image
             }
             $this->locked = bool_escape($this->locked);
 
-            assert(is_int($this->id));
-            assert(is_int($this->height));
-            assert(is_int($this->width));
+            assert(is_numeric($this->id));
+            assert(is_numeric($this->height));
+            assert(is_numeric($this->width));
+
+            $this->id = int_escape($this->id);
+            $this->height = int_escape($this->height);
+            $this->width = int_escape($this->width);
         }
     }