diff --git a/testapps/AndroidManifest.xml b/testapps/AndroidManifest.xml
index cc6470e..ec49696 100644
--- a/testapps/AndroidManifest.xml
+++ b/testapps/AndroidManifest.xml
@@ -169,7 +169,8 @@
 
         <activity android:name="com.android.server.telecom.testapps.SelfManagedCallingActivity"
                   android:label="@string/selfManagedCallingActivityLabel"
-                  android:process="com.android.server.telecom.testapps.SelfMangingCallingApp">
+                  android:process="com.android.server.telecom.testapps.SelfMangingCallingApp"
+                  android:theme="@android:style/Theme.Material.Light">
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.DEFAULT" />