diff --git a/MANIFEST.in b/MANIFEST.in
index 6654fc5..a9d60c7 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -4,6 +4,8 @@ include requirements.txt
 
 include fortran/*.f90
 include fortran/*.pyf
+include fortran/build_help/omp_sizes.f90
+include fortran/build_help/sub_sizes.py
 include build_scripts/*.sh
 include build_scripts/*.bat
 include setup.py