diff --git a/deploy/venv.sls b/deploy/venv.sls
index e4f60851f8c8375c487b0cae2df7babb095267c5..1ee6f8a0f136a8c6ed35b0a83dbe3f98a88a2fad 100644
--- a/deploy/venv.sls
+++ b/deploy/venv.sls
@@ -42,8 +42,8 @@ deploy_{{ project_name }}_venv:
         LANG: en_US.UTF-8
         LC_CTYPE: en_US.UTF-8
         LC_ALL: en_US.UTF-8
-        PIP_TRUSTED_HOST: apt-proxy.it.hs-hannover.de
-        PIP_INDEX_URL: http://apt-proxy.it.hs-hannover.de:3141/root/pypi/+simple/
+        PIP_TRUSTED_HOST: 'apt-proxy.it.hs-hannover.de'
+        PIP_INDEX_URL: 'http://apt-proxy.it.hs-hannover.de:3141/root/pypi/+simple/'
     - require:
         - file: deploy_venv_directory
         - pkg: deploy_venv_pkgs