diff --git a/MANIFEST.in b/MANIFEST.in
index 7c92dad1b..de1953486 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -6,3 +6,5 @@ include README.md
 include LICENSE.md
 recursive-include randomgen  *.py *.pyx *.px[di] *.h *.in *.csv *.md
 graft randomgen/src
+include randomgen/tests/_shim_dist.h
+include randomgen/tests/_shim_dist.c