diff --git a/src/com/android/settings/widget/ChartDataUsageView.java b/src/com/android/settings/widget/ChartDataUsageView.java
index cc9acd6..6fb805b 100644
--- a/src/com/android/settings/widget/ChartDataUsageView.java
+++ b/src/com/android/settings/widget/ChartDataUsageView.java
@@ -22,6 +22,7 @@
 import android.content.res.Resources;
 import android.net.NetworkPolicy;
 import android.net.NetworkStatsHistory;
+import android.net.TrafficStats;
 import android.os.Handler;
 import android.os.Message;
 import android.text.Spannable;
@@ -33,6 +34,7 @@
 import android.text.format.Time;
 import android.util.AttributeSet;
 import android.util.Log;
+import android.util.MathUtils;
 import android.view.MotionEvent;
 import android.view.View;
 
@@ -535,6 +537,7 @@
 
         @Override
         public long buildLabel(Resources res, SpannableStringBuilder builder, long value) {
+            value = MathUtils.constrain(value, 0, TrafficStats.TB_IN_BYTES);
             final BytesResult result = Formatter.formatBytes(res, value,
                     Formatter.FLAG_SHORTER | Formatter.FLAG_CALCULATE_ROUNDED);
             setText(builder, sSpanSize, result.value, "^1");