diff --git a/build/bakefiles/files.bkl b/build/bakefiles/files.bkl
index 37d175b92a..9c684f837e 100644
--- a/build/bakefiles/files.bkl
+++ b/build/bakefiles/files.bkl
@@ -307,6 +307,7 @@
     src/generic/grid.cpp
     src/generic/gridctrl.cpp
     src/generic/gridsel.cpp
+    src/generic/helpext.cpp
     src/generic/laywin.cpp
     src/generic/logg.cpp
     src/generic/numdlgg.cpp