diff --git a/playbooks/mpdf.yaml b/playbooks/mpdf.yaml
index cd8eab9..9bcfc7a 100644
--- a/playbooks/mpdf.yaml
+++ b/playbooks/mpdf.yaml
@@ -40,7 +40,7 @@
   tasks:
     - name: "mpd backendhost"
       set_fact:
-        backendhost: "{{ inventory_hostname |replace ("f", "b") }}"
+        backendhost: "{{ inventory_hostname |replace (f, b) }}"
     - name: Install mpdf on hosts
       apt:
         name: mpd