diff --git a/.dockerignore b/.dockerignore
index 977ed7878..29683e292 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -7,6 +7,7 @@ build
 docs
 tests
 !build/dokku.deb
+!tests/dhparam.pem
 !contrib/dokku-installer.py
 !contrib/dokku-update
 !contrib/bash-completion