diff --git a/modules/restricted-guests/synapse/scripts/run_in_venv.sh b/modules/restricted-guests/synapse/scripts/run_in_venv.sh
index 9f5ba12584..23adf1e03b 100755
--- a/modules/restricted-guests/synapse/scripts/run_in_venv.sh
+++ b/modules/restricted-guests/synapse/scripts/run_in_venv.sh
@@ -19,7 +19,7 @@ venv_path=${repo_root:-./}.venv
 
 if [ ! -d "$venv_path" ]; then
     "python${PYTHON_VERSION:-3}" -m venv "$venv_path"
-    "$venv_path/bin/pip" install -e ."[dev]"
+    "$venv_path/bin/pip" install -e '.[dev]'
 fi
 
 [ $# -gt 1 ] && . "$venv_path/bin/activate" && "$@"