diff --git a/core/dbsearch.class.php b/core/dbsearch.class.php
index d4f5ea4e9..1449122eb 100644
--- a/core/dbsearch.class.php
+++ b/core/dbsearch.class.php
@@ -631,7 +631,7 @@ abstract class DBSearch
 		}
 
 		$sOql = $this->ToOql($bDevelopParams, $aContextParams);
-		return json_encode(array($sOql, $aQueryParams, $this->m_aModifierProperties));
+		return urlencode(json_encode(array($sOql, $aQueryParams, $this->m_aModifierProperties)));
 	}
 
 	/**
@@ -648,7 +648,7 @@ abstract class DBSearch
 	 */
 	static public function unserialize($sValue)
 	{
-		$aData = json_decode($sValue, true);
+		$aData = json_decode(urldecode($sValue), true);
 		if (is_null($aData))
 		{
 			throw new CoreException("Invalid filter parameter");