diff --git a/development/scons/scons_manifest.py b/development/scons/scons_manifest.py
index 08f020d932..9c2df11d05 100644
--- a/development/scons/scons_manifest.py
+++ b/development/scons/scons_manifest.py
@@ -2723,9 +2723,11 @@ lib_lyx2lyx_files = Split('''
     lyx_1_5.py
     lyx_1_6.py
     lyx_2_0.py
+    lyx2lyx_tools.py
     parser_tools.py
     profiling.py
     test_parser_tools.py
+    unicode_symbols.py
 ''')