diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index e4a0db3c3..d0cf2d604 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -53,6 +53,7 @@
 -keep class org.mozilla.vrbrowser.ui.widgets.Windows$** {*;} # Keep state clases used by gson.
 -keep class org.mozilla.vrbrowser.browser.engine.** {*;} # Keep state clases used by gson.
 -keep class org.mozilla.vrbrowser.utils.RemoteProperties {*;} # Keep state clases used by gson.
+-keep class org.mozilla.vrbrowser.utils.Environment {*;} # Keep state clases used by gson.
 
 # --------------------------------------------------------------------
 # Keep classes from HTC SDK