diff --git a/roles/pki-intermediate-ca/defaults/main.yml b/roles/pki-intermediate-ca/defaults/main.yml
index feecca8..c8ec9c9 100644
--- a/roles/pki-intermediate-ca/defaults/main.yml
+++ b/roles/pki-intermediate-ca/defaults/main.yml
@@ -10,7 +10,7 @@
 ca_im_days: 730
 
 # passphrases for the certificate
-ca_im_phrase: "{{ lookup('password', credentials_dir+'/ca_im_phrase length=64') }}"
+ca_im_phrase: "{{ lookup('password', credentials_dir ~ '/ca_im_phrase length=64') }}"
 
 # noninteractive csr subject
 ca_im_subj: "/C=US/ST=California/L=Menlo Park/O=ON.Lab/OU=Test Deployment/CN=CORD Test Deployment Intermediate CA"