diff --git a/library/cpp/yt/system/exit.h b/library/cpp/yt/system/exit.h
index e06c0bd3d..15261d633 100644
--- a/library/cpp/yt/system/exit.h
+++ b/library/cpp/yt/system/exit.h
@@ -13,6 +13,7 @@ DEFINE_ENUM(EProcessExitCode,
     ((ArgumentsError)      (1))
     ((GenericError)        (2))
     ((IOError)             (3))
+    ((InternalError)       (4))
     ((OutOfMemory)         (9))
 );