diff --git a/lib/Model.php b/lib/Model.php
index 6164f8d35..52cdf2e58 100644
--- a/lib/Model.php
+++ b/lib/Model.php
@@ -848,7 +848,7 @@ private function insert($validate=true)
 			$column = $table->get_column_by_inflected_name($pk);
 
 			if ($column->auto_increment || $use_sequence)
-				$this->attributes[$pk] = static::connection()->insert_id($table->sequence);
+				$this->attributes[$pk] = $column->cast(static::connection()->insert_id($table->sequence), static::connection());
 		}
 
 		$this->__new_record = false;
diff --git a/test/ActiveRecordWriteTest.php b/test/ActiveRecordWriteTest.php
index 48c156c34..863929339 100644
--- a/test/ActiveRecordWriteTest.php
+++ b/test/ActiveRecordWriteTest.php
@@ -194,6 +194,18 @@ public function test_dirty_attributes()
 		$this->assert_equals(array('name','special'),array_keys($book->dirty_attributes()));
 	}
 
+	public function test_id_type()
+	{
+		$book = new Book;
+		$book->save();
+
+		$bookFromFind = Book::find($book->id);
+
+		// both should be ints
+		$this->assert_same($book->id, $bookFromFind->id);
+	}
+
+
 	public function test_dirty_attributes_cleared_after_saving()
 	{
 		$book = $this->make_new_book_and();