diff --git a/java/proguard.flags b/java/proguard.flags
index 7ce6f41..44416ec 100644
--- a/java/proguard.flags
+++ b/java/proguard.flags
@@ -30,3 +30,7 @@
 -keep class com.android.inputmethod.latin.SettingsActivity {
   *;
 }
+
+-keep class com.android.inputmethod.keyboard.internal.MiniKeyboardBuilder$MiniKeyboardLayoutParams {
+  <init>(...);
+}