diff --git a/core/java/com/android/internal/os/BatteryStatsImpl.java b/core/java/com/android/internal/os/BatteryStatsImpl.java
index 10afdb8ef109e..5657fb8713728 100644
--- a/core/java/com/android/internal/os/BatteryStatsImpl.java
+++ b/core/java/com/android/internal/os/BatteryStatsImpl.java
@@ -3397,7 +3397,7 @@ public class BatteryStatsImpl extends BatteryStats {
                     powerState == DataConnectionRealTimeInfo.DC_POWER_STATE_MEDIUM
                             || powerState == DataConnectionRealTimeInfo.DC_POWER_STATE_HIGH;
             if (active) {
-                mMobileRadioActiveStartTime = realElapsedRealtimeMs = elapsedRealtime;
+                mMobileRadioActiveStartTime = realElapsedRealtimeMs = timestampNs / (1000 * 1000);
                 mHistoryCur.states |= HistoryItem.STATE_MOBILE_RADIO_ACTIVE_FLAG;
             } else {
                 realElapsedRealtimeMs = timestampNs / (1000*1000);