diff --git a/libraries/joomla/form/rule/options.php b/libraries/joomla/form/rule/options.php
index 7b98ffb5bef67..5418002ec2916 100644
--- a/libraries/joomla/form/rule/options.php
+++ b/libraries/joomla/form/rule/options.php
@@ -53,7 +53,9 @@ public function test(SimpleXMLElement $element, $value, $group = null, Registry
 		}
 		else
 		{
-			return in_array($value, $options);
+			// In this case value must be a string
+
+			return in_array((string) $value, $options);
 		}
 	}
 }