diff --git a/java/AndroidManifest.xml b/java/AndroidManifest.xml
index ab9b13e..702b7ae 100644
--- a/java/AndroidManifest.xml
+++ b/java/AndroidManifest.xml
@@ -86,7 +86,7 @@
         </receiver>
 
         <activity android:name=".settings.SettingsActivity"
-                android:theme="@style/platformActivityTheme"
+                android:theme="@style/platformSettingsTheme"
                 android:label="@string/english_ime_settings"
                 android:uiOptions="splitActionBarWhenNarrow">
             <intent-filter>
@@ -95,7 +95,7 @@
         </activity>
 
         <activity android:name=".spellcheck.SpellCheckerSettingsActivity"
-                  android:theme="@style/platformActivityTheme"
+                  android:theme="@style/platformSettingsTheme"
                   android:label="@string/android_spell_checker_settings">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -103,7 +103,7 @@
         </activity>
 
         <activity android:name=".settings.DebugSettingsActivity"
-                android:theme="@style/platformActivityTheme"
+                android:theme="@style/platformSettingsTheme"
                 android:label="@string/english_ime_debug_settings">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -150,7 +150,7 @@
         </receiver>
 
         <activity android:name="com.android.inputmethod.dictionarypack.DictionarySettingsActivity"
-                android:theme="@style/platformActivityTheme"
+                android:theme="@style/platformSettingsTheme"
                 android:label="@string/dictionary_settings_title"
                 android:uiOptions="splitActionBarWhenNarrow">
             <intent-filter>
diff --git a/java/res/values-v20/platform-theme.xml b/java/res/values-v21/platform-theme.xml
similarity index 83%
rename from java/res/values-v20/platform-theme.xml
rename to java/res/values-v21/platform-theme.xml
index 52e7f35..2a54798 100644
--- a/java/res/values-v20/platform-theme.xml
+++ b/java/res/values-v21/platform-theme.xml
@@ -18,9 +18,8 @@
 */
 -->
 
-<!-- TODO: This file is temporarily placed under values-v20. -->
-<!-- TODO: It might be moved under values-v21. -->
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
-    <style name="platformActivityTheme" parent="@android:style/Theme.Material.Light" />
-    <style name="platformDialogTheme" parent="@android:style/Theme.Material.Light.Dialog" />
+    <style name="platformActivityTheme" parent="@android:style/Theme.DeviceDefault.Light" />
+    <style name="platformSettingsTheme" parent="@android:style/Theme.DeviceDefault.Light" />
+    <style name="platformDialogTheme" parent="@android:style/Theme.DeviceDefault.Light.Dialog" />
 </resources>
diff --git a/java/res/values/platform-theme.xml b/java/res/values/platform-theme.xml
index 8e131a2..2854ff7 100644
--- a/java/res/values/platform-theme.xml
+++ b/java/res/values/platform-theme.xml
@@ -19,6 +19,7 @@
 -->
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
-    <style name="platformActivityTheme" parent="@android:style/Theme.Holo" />
-    <style name="platformDialogTheme" parent="@android:style/Theme.Holo.Dialog" />
+    <style name="platformActivityTheme" parent="@android:style/Theme.DeviceDefault" />
+    <style name="platformSettingsTheme" parent="@android:style/Theme.DeviceDefault" />
+    <style name="platformDialogTheme" parent="@android:style/Theme.DeviceDefault.Dialog" />
 </resources>