diff --git a/.travis/build.sh b/.travis/build.sh
index e46f0b380..7f0fab92a 100755
--- a/.travis/build.sh
+++ b/.travis/build.sh
@@ -26,6 +26,7 @@ if [ ! -f dependencies/bin/bitcoind ]; then
 fi
 
 pyenv global 3.7
+pip3 install --user --quiet mako
 pip3 install --user --quiet -r tests/requirements.txt
 pip3 install --quiet \
      pytest-test-groups==1.0.3