diff --git a/android-project/app/proguard-rules.pro b/android-project/app/proguard-rules.pro
index e588abdfc4..691b93d83b 100644
--- a/android-project/app/proguard-rules.pro
+++ b/android-project/app/proguard-rules.pro
@@ -40,6 +40,7 @@
     boolean showToast(java.lang.String, int, int, int, int);
     boolean sendMessage(int, int);
     boolean setActivityTitle(java.lang.String);
+    void setBackButtonTrapEnabled(boolean);
     boolean setCustomCursor(int);
     void setOrientation(int, int, boolean, java.lang.String);
     boolean setRelativeMouseEnabled(boolean);