diff --git a/pandora_agents/unix/ChangeLog b/pandora_agents/unix/ChangeLog
index 14ce105bb4..b43451494b 100644
--- a/pandora_agents/unix/ChangeLog
+++ b/pandora_agents/unix/ChangeLog
@@ -1,3 +1,7 @@
+2011-09-05  Koichiro Kikuchi <koichiro@rworks.jp>
+
+	* pandora_agent_daemon: Added support for OpenVZ/Virtuozzo.
+
 2011-09-02  Koichiro Kikuchi <koichiro@rworks.jp>
 
 	* pandora_agent: Now module_condition and module_precondition
diff --git a/pandora_agents/unix/pandora_agent_daemon b/pandora_agents/unix/pandora_agent_daemon
index d5ddb4abaf..c237568600 100755
--- a/pandora_agents/unix/pandora_agent_daemon
+++ b/pandora_agents/unix/pandora_agent_daemon
@@ -52,6 +52,17 @@ pidof_pandora () {
 			else
 				PANDORA_PID=`ps -Af | grep "$TRUNCATED_DAEMON" | grep -v grep | head -1 | awk '{ print $2 }'`
 			fi
+		elif [ "$OS_NAME" = "Linux" -a -x /usr/sbin/vzpid ]
+		then
+			for _pid in `ps -Af | grep "$DAEMON $PANDORA_PATH" | grep -v grep | awk '{ print $2 }'`
+			do
+				_ctid=`/usr/sbin/vzpid $_pid | awk '$1 == '$_pid' { print $2 }'`
+				if [ "X$_ctid" = "X0" ]
+				then
+					PANDORA_PID=$_pid
+					break
+				fi
+			done
 		else
 			PANDORA_PID=`ps -Af | grep "$DAEMON $PANDORA_PATH" | grep -v grep | head -1 | awk '{ print $2 }'`
 		fi