diff --git a/homepage/config/services.yaml b/homepage/config/services.yaml
index 4ef1a3f..d22a594 100644
--- a/homepage/config/services.yaml
+++ b/homepage/config/services.yaml
@@ -348,8 +348,8 @@
 - DockerServer1:
     - Sterling PDF:
         icon: stirling-pdf.png
-        href: "{{}}"
-        siteMonitor: "{{}}"
+        href: "{{HOMEPAGE_VAR_STIRLING_PDF_URL}}"
+        siteMonitor: "{{HOMEPAGE_VAR_STIRLING_PDF_URL}}"
         target: _blank
 
 - DockerServer2: