diff --git a/java/res/values-v20/platform-theme.xml b/java/res/values-v20/platform-theme.xml
index 0606204..52e7f35 100644
--- a/java/res/values-v20/platform-theme.xml
+++ b/java/res/values-v20/platform-theme.xml
@@ -21,6 +21,6 @@
 <!-- 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.Quantum.Light" />
-    <style name="platformDialogTheme" parent="@android:style/Theme.Quantum.Light.Dialog" />
+    <style name="platformActivityTheme" parent="@android:style/Theme.Material.Light" />
+    <style name="platformDialogTheme" parent="@android:style/Theme.Material.Light.Dialog" />
 </resources>