diff --git a/InCallUI/proguard.flags b/InCallUI/proguard.flags
index bc88143..4e8310c 100644
--- a/InCallUI/proguard.flags
+++ b/InCallUI/proguard.flags
@@ -6,3 +6,9 @@
 -keepclasseswithmembers class com.android.incallui.AnimationUtils$CrossFadeDrawable {
     *** setCrossFadeAlpha(...);
 }
+
+# Any class or method annotated with NeededForTesting or NeededForReflection.
+-keepclassmembers class * {
+@com.android.contacts.common.test.NeededForTesting *;
+@com.android.incallui.NeededForReflection *;
+}