diff --git a/Tethering/src/com/android/networkstack/tethering/Tethering.java b/Tethering/src/com/android/networkstack/tethering/Tethering.java
index 5a0c5b0cff..2c91d100ec 100644
--- a/Tethering/src/com/android/networkstack/tethering/Tethering.java
+++ b/Tethering/src/com/android/networkstack/tethering/Tethering.java
@@ -1079,9 +1079,14 @@ public class Tethering {
         }
     }
 
+    @VisibleForTesting
+    SparseArray<TetheringRequestParcel> getActiveTetheringRequests() {
+        return mActiveTetheringRequests;
+    }
+
     @VisibleForTesting
     boolean isTetheringActive() {
-        return mActiveTetheringRequests.size() > 0;
+        return getTetheredIfaces().length > 0;
     }
 
     @VisibleForTesting
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
index 37a4d90a72..0a37f54aaa 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
@@ -52,6 +52,7 @@ import static android.net.wifi.WifiManager.WIFI_AP_STATE_ENABLED;
 import static android.telephony.SubscriptionManager.INVALID_SUBSCRIPTION_ID;
 
 import static com.android.net.module.util.Inet4AddressUtils.intToInet4AddressHTH;
+import static com.android.networkstack.tethering.Tethering.UserRestrictionActionListener;
 import static com.android.networkstack.tethering.TetheringNotificationUpdater.DOWNSTREAM_NONE;
 import static com.android.networkstack.tethering.UpstreamNetworkMonitor.EVENT_ON_CAPABILITIES;
 
@@ -735,9 +736,12 @@ public class TetheringTest {
         initTetheringUpstream(upstreamState);
 
         // Emulate pressing the USB tethering button in Settings UI.
-        mTethering.startTethering(createTetheringRequestParcel(TETHERING_USB), null);
+        final TetheringRequestParcel request = createTetheringRequestParcel(TETHERING_USB);
+        mTethering.startTethering(request, null);
         mLooper.dispatchAll();
         verify(mUsbManager, times(1)).setCurrentFunctions(UsbManager.FUNCTION_RNDIS);
+        assertEquals(1, mTethering.getActiveTetheringRequests().size());
+        assertEquals(request, mTethering.getActiveTetheringRequests().get(TETHERING_USB));
 
         mTethering.interfaceStatusChanged(TEST_USB_IFNAME, true);
     }
@@ -1174,20 +1178,26 @@ public class TetheringTest {
         verifyNoMoreInteractions(mNetd);
     }
 
+    private UserRestrictionActionListener makeUserRestrictionActionListener(
+            final Tethering tethering, final boolean currentDisallow, final boolean nextDisallow) {
+        final Bundle newRestrictions = new Bundle();
+        newRestrictions.putBoolean(UserManager.DISALLOW_CONFIG_TETHERING, nextDisallow);
+        when(mUserManager.getUserRestrictions()).thenReturn(newRestrictions);
+
+        final UserRestrictionActionListener ural =
+                new UserRestrictionActionListener(mUserManager, tethering, mNotificationUpdater);
+        ural.mDisallowTethering = currentDisallow;
+        return ural;
+    }
+
     private void runUserRestrictionsChange(
             boolean currentDisallow, boolean nextDisallow, boolean isTetheringActive,
             int expectedInteractionsWithShowNotification) throws  Exception {
-        final Bundle newRestrictions = new Bundle();
-        newRestrictions.putBoolean(UserManager.DISALLOW_CONFIG_TETHERING, nextDisallow);
         final Tethering mockTethering = mock(Tethering.class);
         when(mockTethering.isTetheringActive()).thenReturn(isTetheringActive);
-        when(mUserManager.getUserRestrictions()).thenReturn(newRestrictions);
-
-        final Tethering.UserRestrictionActionListener ural =
-                new Tethering.UserRestrictionActionListener(
-                        mUserManager, mockTethering, mNotificationUpdater);
-        ural.mDisallowTethering = currentDisallow;
 
+        final UserRestrictionActionListener ural =
+                makeUserRestrictionActionListener(mockTethering, currentDisallow, nextDisallow);
         ural.onUserRestrictionsChanged();
 
         verify(mNotificationUpdater, times(expectedInteractionsWithShowNotification))
@@ -1256,6 +1266,27 @@ public class TetheringTest {
                 expectedInteractionsWithShowNotification);
     }
 
+    @Test
+    public void testUntetherUsbWhenRestrictionIsOn() {
+        // Start usb tethering and check that usb interface is tethered.
+        final UpstreamNetworkState upstreamState = buildMobileIPv4UpstreamState();
+        runUsbTethering(upstreamState);
+        assertContains(Arrays.asList(mTethering.getTetheredIfaces()), TEST_USB_IFNAME);
+        assertTrue(mTethering.isTetheringActive());
+        assertEquals(0, mTethering.getActiveTetheringRequests().size());
+
+        final Tethering.UserRestrictionActionListener ural = makeUserRestrictionActionListener(
+                mTethering, false /* currentDisallow */, true /* nextDisallow */);
+
+        ural.onUserRestrictionsChanged();
+        mLooper.dispatchAll();
+
+        // Verify that restriction notification has showed to user.
+        verify(mNotificationUpdater, times(1)).notifyTetheringDisabledByRestriction();
+        // Verify that usb tethering has been disabled.
+        verify(mUsbManager, times(1)).setCurrentFunctions(UsbManager.FUNCTION_NONE);
+    }
+
     private class TestTetheringEventCallback extends ITetheringEventCallback.Stub {
         private final ArrayList<Network> mActualUpstreams = new ArrayList<>();
         private final ArrayList<TetheringConfigurationParcel> mTetheringConfigs =