diff --git a/compiler/compiler.pro b/compiler/compiler.pro
index f1c9f051d03..4159d20b866 100644
--- a/compiler/compiler.pro
+++ b/compiler/compiler.pro
@@ -93,6 +93,9 @@ messages/**)
 -keep class com.intellij.openapi.util.io.ZipFileCache { public *; }
 -keep class com.intellij.openapi.util.LowMemoryWatcher { public *; }
 
+# for j2k
+-keep class com.intellij.codeInsight.NullableNotNullManager { public protected *; }
+
 -keepclassmembers enum * {
     public static **[] values();
     public static ** valueOf(java.lang.String);