diff --git a/src/Fields/SelectField.php b/src/Fields/SelectField.php
index 1bbda23..b1f4442 100644
--- a/src/Fields/SelectField.php
+++ b/src/Fields/SelectField.php
@@ -114,9 +114,9 @@ public function isSelected($id)
         } else {
             $value = $this->getValue();
             if ($value instanceof Model) {
-                return ($value->{$this->getRelatedKey()} === $id);
+                return ($value->{$this->getRelatedKey()} == $id);
             } else {
-                return ($value === $id);
+                return ($value == $id);
             }
         }
     }