diff --git a/packages/SystemUI/res/values/dimens.xml b/packages/SystemUI/res/values/dimens.xml
index e1f7e7e567260..52b93eeaea909 100644
--- a/packages/SystemUI/res/values/dimens.xml
+++ b/packages/SystemUI/res/values/dimens.xml
@@ -176,8 +176,8 @@
     <!-- Minimum height of a notification to be interactable -->
     <dimen name="notification_min_interaction_height">40dp</dimen>
 
-    <!-- New radius for notifications. -->
-    <dimen name="notification_corner_radius">20dp</dimen>
+    <!-- Radius for notifications corners without adjacent notifications -->
+    <dimen name="notification_corner_radius">28dp</dimen>
 
     <!-- the padding of the shelf icon container -->
     <dimen name="shelf_icon_container_padding">13dp</dimen>
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationRoundnessManager.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationRoundnessManager.java
index 31600710057b0..079cf77767c00 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationRoundnessManager.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationRoundnessManager.java
@@ -20,12 +20,9 @@ import android.util.MathUtils;
 
 import com.android.systemui.dagger.SysUISingleton;
 import com.android.systemui.statusbar.notification.NotificationSectionsFeatureManager;
-import com.android.systemui.statusbar.notification.collection.NotificationEntry;
 import com.android.systemui.statusbar.notification.row.ExpandableNotificationRow;
 import com.android.systemui.statusbar.notification.row.ExpandableView;
 import com.android.systemui.statusbar.phone.KeyguardBypassController;
-import com.android.systemui.statusbar.policy.HeadsUpManager;
-import com.android.systemui.statusbar.policy.OnHeadsUpChangedListener;
 
 import java.util.HashSet;
 
@@ -48,6 +45,11 @@ public class NotificationRoundnessManager {
     private ExpandableNotificationRow mTrackedHeadsUp;
     private float mAppearFraction;
 
+    // Radius for notification corners WITH adjacent notifications
+    // as percent of radius WITHOUT adjacent notifications.
+    // TODO(b/175710408) pull from dimens and hide from beta builds.
+    static final float SMALL_CORNER_RADIUS = 4f/28;
+
     @Inject
     NotificationRoundnessManager(
             KeyguardBypassController keyguardBypassController,
@@ -126,7 +128,7 @@ public class NotificationRoundnessManager {
         if (view.showingPulsing() && !mBypassController.getBypassEnabled()) {
             return 1.0f;
         }
-        return 0.0f;
+        return SMALL_CORNER_RADIUS;
     }
 
     public void setExpanded(float expandedHeight, float appearFraction) {
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/NotificationRoundnessManagerTest.java b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/NotificationRoundnessManagerTest.java
index cb3e5e262df11..63bfd6ab25cc1 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/NotificationRoundnessManagerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/stack/NotificationRoundnessManagerTest.java
@@ -16,6 +16,8 @@
 
 package com.android.systemui.statusbar.notification.stack;
 
+import static com.android.systemui.statusbar.notification.stack.NotificationRoundnessManager.SMALL_CORNER_RADIUS;
+
 import static org.mockito.Mockito.atLeast;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
@@ -139,7 +141,7 @@ public class NotificationRoundnessManagerTest extends SysuiTestCase {
                 createSection(null, null)
         });
         Assert.assertEquals(1.0f, mSecond.getCurrentBottomRoundness(), 0.0f);
-        Assert.assertEquals(0.0f, mSecond.getCurrentTopRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mSecond.getCurrentTopRoundness(), 0.0f);
     }
 
     @Test
@@ -166,8 +168,8 @@ public class NotificationRoundnessManagerTest extends SysuiTestCase {
 
         row.setHeadsUp(false);
         mRoundnessManager.updateView(entry.getRow(), false);
-        Assert.assertEquals(0f, row.getCurrentBottomRoundness(), 0.0f);
-        Assert.assertEquals(0f, row.getCurrentTopRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, row.getCurrentBottomRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, row.getCurrentTopRoundness(), 0.0f);
     }
 
     @Test
@@ -177,7 +179,7 @@ public class NotificationRoundnessManagerTest extends SysuiTestCase {
                 createSection(null, mSecond)
         });
         Assert.assertEquals(1.0f, mSecond.getCurrentBottomRoundness(), 0.0f);
-        Assert.assertEquals(0.0f, mSecond.getCurrentTopRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mSecond.getCurrentTopRoundness(), 0.0f);
     }
 
     @Test
@@ -186,7 +188,7 @@ public class NotificationRoundnessManagerTest extends SysuiTestCase {
                 createSection(mFirst, mFirst),
                 createSection(mSecond, null)
         });
-        Assert.assertEquals(0.0f, mSecond.getCurrentBottomRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mSecond.getCurrentBottomRoundness(), 0.0f);
         Assert.assertEquals(1.0f, mSecond.getCurrentTopRoundness(), 0.0f);
     }
 
@@ -196,7 +198,7 @@ public class NotificationRoundnessManagerTest extends SysuiTestCase {
                 createSection(mFirst, null),
                 createSection(null, null)
         });
-        Assert.assertEquals(0.0f, mFirst.getCurrentBottomRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mFirst.getCurrentBottomRoundness(), 0.0f);
         Assert.assertEquals(1.0f, mFirst.getCurrentTopRoundness(), 0.0f);
     }
 
@@ -206,8 +208,8 @@ public class NotificationRoundnessManagerTest extends SysuiTestCase {
                 createSection(mSecond, mSecond),
                 createSection(null, null)
         });
-        Assert.assertEquals(0.0f, mFirst.getCurrentBottomRoundness(), 0.0f);
-        Assert.assertEquals(0.0f, mFirst.getCurrentTopRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mFirst.getCurrentBottomRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mFirst.getCurrentTopRoundness(), 0.0f);
     }
 
     @Test
@@ -253,8 +255,8 @@ public class NotificationRoundnessManagerTest extends SysuiTestCase {
                 createSection(mSecond, mSecond),
                 createSection(null, null)
         });
-        Assert.assertEquals(0.0f, mFirst.getCurrentBottomRoundness(), 0.0f);
-        Assert.assertEquals(0.0f, mFirst.getCurrentTopRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mFirst.getCurrentBottomRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mFirst.getCurrentTopRoundness(), 0.0f);
     }
 
     @Test
@@ -303,8 +305,8 @@ public class NotificationRoundnessManagerTest extends SysuiTestCase {
         });
         mFirst.setHeadsUpAnimatingAway(true);
         mFirst.setHeadsUpAnimatingAway(false);
-        Assert.assertEquals(0.0f, mFirst.getCurrentBottomRoundness(), 0.0f);
-        Assert.assertEquals(0.0f, mFirst.getCurrentTopRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mFirst.getCurrentBottomRoundness(), 0.0f);
+        Assert.assertEquals(SMALL_CORNER_RADIUS, mFirst.getCurrentTopRoundness(), 0.0f);
     }
 
     @Test