diff --git a/includes/polling/applications/ntp-client.inc.php b/includes/polling/applications/ntp-client.inc.php
index bd6cc0db0..92c7ff097 100644
--- a/includes/polling/applications/ntp-client.inc.php
+++ b/includes/polling/applications/ntp-client.inc.php
@@ -15,11 +15,11 @@ list ($offset, $frequency, $jitter, $noise, $stability) = explode("\n", $ntpclie
 if (!is_file($rrd_filename))
 {
   rrdtool_create($rrd_filename, "--step 300 \
-        DS:offset:GAUGE:600:0:125000000000 \
-        DS:frequency:GAUGE:600:0:125000000000 \
-        DS:jitter:GAUGE:600:0:125000000000 \
-        DS:noise:GAUGE:600:0:125000000000 \
-        DS:stability:GAUGE:600:0:125000000000 \
+        DS:offset:GAUGE:600:-100:125000000000 \
+        DS:frequency:GAUGE:600:-100:125000000000 \
+        DS:jitter:GAUGE:600:-100:125000000000 \
+        DS:noise:GAUGE:600:-100:125000000000 \
+        DS:stability:GAUGE:600:-100:125000000000 \
         RRA:AVERAGE:0.5:1:600 \
         RRA:AVERAGE:0.5:6:700 \
         RRA:AVERAGE:0.5:24:775 \
diff --git a/includes/polling/applications/ntpd-server.inc.php b/includes/polling/applications/ntpd-server.inc.php
index f0dfd415d..f64fd038e 100644
--- a/includes/polling/applications/ntpd-server.inc.php
+++ b/includes/polling/applications/ntpd-server.inc.php
@@ -15,12 +15,12 @@ list ($stratum, $offset, $frequency, $jitter, $noise, $stability, $uptime, $buff
 if (!is_file($rrd_filename))
 {
   rrdtool_create($rrd_filename, "--step 300 \
-        DS:stratum:GAUGE:600:0:125000000000 \
-        DS:offset:GAUGE:600:0:125000000000 \
-        DS:frequency:GAUGE:600:0:125000000000 \
-        DS:jitter:GAUGE:600:0:125000000000 \
-        DS:noise:GAUGE:600:0:125000000000 \
-        DS:stability:GAUGE:600:0:125000000000 \
+        DS:stratum:GAUGE:600:-100:125000000000 \
+        DS:offset:GAUGE:600:-100:125000000000 \
+        DS:frequency:GAUGE:600:-100:125000000000 \
+        DS:jitter:GAUGE:600:-100:125000000000 \
+        DS:noise:GAUGE:600:-100:125000000000 \
+        DS:stability:GAUGE:600:-100:125000000000 \
         DS:uptime:GAUGE:600:0:125000000000 \
         DS:buffer_recv:GAUGE:600:0:125000000000 \
         DS:buffer_free:GAUGE:600:0:125000000000 \