diff --git a/core/java/android/content/res/Configuration.java b/core/java/android/content/res/Configuration.java
index ee1f1907fcb87..e039512f4fe4c 100644
--- a/core/java/android/content/res/Configuration.java
+++ b/core/java/android/content/res/Configuration.java
@@ -1047,18 +1047,29 @@ public final class Configuration implements Parcelable, Comparable<Configuration
             changed |= ActivityInfo.CONFIG_ORIENTATION;
             orientation = delta.orientation;
         }
-        if (getScreenLayoutNoDirection(delta.screenLayout) !=
-                    (SCREENLAYOUT_SIZE_UNDEFINED | SCREENLAYOUT_LONG_UNDEFINED)
-                && (getScreenLayoutNoDirection(screenLayout) !=
-                    getScreenLayoutNoDirection(delta.screenLayout))) {
+
+        if (((delta.screenLayout & SCREENLAYOUT_SIZE_MASK) != SCREENLAYOUT_SIZE_UNDEFINED)
+                && (delta.screenLayout & SCREENLAYOUT_SIZE_MASK)
+                != (screenLayout & SCREENLAYOUT_SIZE_MASK)) {
             changed |= ActivityInfo.CONFIG_SCREEN_LAYOUT;
-            // We need to preserve the previous layout dir bits if they were defined
-            if ((delta.screenLayout&SCREENLAYOUT_LAYOUTDIR_MASK) == 0) {
-                screenLayout = (screenLayout&SCREENLAYOUT_LAYOUTDIR_MASK)|delta.screenLayout;
-            } else {
-                screenLayout = delta.screenLayout;
-            }
+            screenLayout = (screenLayout & ~SCREENLAYOUT_SIZE_MASK)
+                    | (delta.screenLayout & SCREENLAYOUT_SIZE_MASK);
         }
+        if (((delta.screenLayout & SCREENLAYOUT_LONG_MASK) != SCREENLAYOUT_LONG_UNDEFINED)
+                && (delta.screenLayout & SCREENLAYOUT_LONG_MASK)
+                != (screenLayout & SCREENLAYOUT_LONG_MASK)) {
+            changed |= ActivityInfo.CONFIG_SCREEN_LAYOUT;
+            screenLayout = (screenLayout & ~SCREENLAYOUT_LONG_MASK)
+                    | (delta.screenLayout & SCREENLAYOUT_LONG_MASK);
+        }
+        if (((delta.screenLayout & SCREENLAYOUT_ROUND_MASK) != SCREENLAYOUT_ROUND_UNDEFINED)
+                && (delta.screenLayout & SCREENLAYOUT_ROUND_MASK)
+                != (screenLayout & SCREENLAYOUT_ROUND_MASK)) {
+            changed |= ActivityInfo.CONFIG_SCREEN_LAYOUT;
+            screenLayout = (screenLayout & ~SCREENLAYOUT_ROUND_MASK)
+                    | (delta.screenLayout & SCREENLAYOUT_ROUND_MASK);
+        }
+
         if (delta.uiMode != (UI_MODE_TYPE_UNDEFINED|UI_MODE_NIGHT_UNDEFINED)
                 && uiMode != delta.uiMode) {
             changed |= ActivityInfo.CONFIG_UI_MODE;
diff --git a/core/tests/coretests/src/android/content/res/ConfigurationTest.java b/core/tests/coretests/src/android/content/res/ConfigurationTest.java
new file mode 100644
index 0000000000000..3138c8f36fa66
--- /dev/null
+++ b/core/tests/coretests/src/android/content/res/ConfigurationTest.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package android.content.res;
+
+import org.junit.runner.RunWith;
+import org.junit.Test;
+import org.junit.runners.JUnit4;
+
+import android.content.res.Configuration;
+import android.support.test.filters.SmallTest;
+import android.platform.test.annotations.Presubmit;
+
+import junit.framework.TestCase;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Build/install/run: bit FrameworksCoreTests:android.content.res.ConfigurationTest
+ */
+
+@RunWith(JUnit4.class)
+@SmallTest
+@Presubmit
+public class ConfigurationTest extends TestCase {
+    @Test
+    public void testUpdateFromPreservesRoundBit() {
+        Configuration config = new Configuration();
+        config.screenLayout = Configuration.SCREENLAYOUT_ROUND_YES;
+        Configuration config2 = new Configuration();
+
+        config.updateFrom(config2);
+        assertEquals(config.screenLayout, Configuration.SCREENLAYOUT_ROUND_YES);
+    }
+}