diff --git a/build.xml b/build.xml
index 1fb47cda677..bd8aac683fe 100644
--- a/build.xml
+++ b/build.xml
@@ -554,6 +554,10 @@
                         public protected *;
                     }
 
+                    -keep class org.jetbrains.kotlin.** {
+                        public protected *;
+                    }
+
                     -keep class jet.** {
                         public protected *;
                     }