diff --git a/app/conferences_active/conference_interactive_inc.php b/app/conferences_active/conference_interactive_inc.php
index d70af380c0..c06282127a 100644
--- a/app/conferences_active/conference_interactive_inc.php
+++ b/app/conferences_active/conference_interactive_inc.php
@@ -199,7 +199,7 @@ else {
 						}
 					//volume
 						if (permission_exists('conference_interactive_volume')) {
-							echo "	<input type='button' class='btn' onclick=\"send_cmd('conference_exec.php?direction=up&cmd=conference&name=".$conference_name."%&data=volume_in&id=".$id."');\" value='+".$text['label-volume']."'>\n";
+							echo "	<input type='button' class='btn' onclick=\"send_cmd('conference_exec.php?direction=up&cmd=conference&name=".$conference_name."&data=volume_in&id=".$id."');\" value='+".$text['label-volume']."'>\n";
 							echo "	<input type='button' class='btn' onclick=\"send_cmd('conference_exec.php?direction=down&cmd=conference&name=".$conference_name."&data=volume_in&id=".$id."');\" value='-".$text['label-volume']."'>\n";
 						}
 						if (permission_exists('conference_interactive_gain')) {