diff --git a/synapse/install.sh b/synapse/install.sh
index 37dfd7d7e2..1b27f0952d 100755
--- a/synapse/install.sh
+++ b/synapse/install.sh
@@ -25,6 +25,7 @@ source env/bin/activate
 pip install --upgrade pip
 pip install --upgrade setuptools
 pip install .
+pip install jinja2 # We use the ConsentResource, which requires jinja2
 python -m synapse.app.homeserver \
     --server-name localhost \
     --config-path homeserver.yaml \