diff --git a/travis-ci/vmtest/run_vmtest.sh b/travis-ci/vmtest/run_vmtest.sh
index f828dc0..39867e7 100755
--- a/travis-ci/vmtest/run_vmtest.sh
+++ b/travis-ci/vmtest/run_vmtest.sh
@@ -19,6 +19,7 @@ wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
 echo "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic main" | sudo tee -a /etc/apt/sources.list
 sudo apt-get update
 sudo apt-get -y install clang-12 lld-12 llvm-12
+sudo apt-get -y install python-docutils # for rst2man
 
 travis_fold end install_clang