diff --git a/Classes/ExpressionParser.php b/Classes/ExpressionParser.php
index 38aef83..f25ed96 100644
--- a/Classes/ExpressionParser.php
+++ b/Classes/ExpressionParser.php
@@ -214,7 +214,7 @@ public static function evaluateExpression($expression) {
 						case 'gp':
 							try {
 								$returnValue = self::getValue(
-									array_merge(
+									array_merge_recursive(
 										GeneralUtility::_GET(),
 										GeneralUtility::_POST()
 									),