diff --git a/src/etc/inc/rrd.inc b/src/etc/inc/rrd.inc
index 37d9b071b..0ce26fa71 100644
--- a/src/etc/inc/rrd.inc
+++ b/src/etc/inc/rrd.inc
@@ -559,7 +559,7 @@ function enable_rrd_graphing()
 
         /* enter UNKNOWN values in the RRD so it knows we rebooted. */
         if (file_exists("/var/run/booting")) {
-            mwexec("$rrdtool update $rrddbpath$ifname$cputemp N:U:U:U:U:U");
+            mwexec("$rrdtool update $rrddbpath$ifname$cputemp N:U");
         }
 
         /* the CPU Temperature gathering function */