diff --git a/robots.txt.tmpl b/robots.txt.tmpl
index eb17ffb..257998c 100644
--- a/robots.txt.tmpl
+++ b/robots.txt.tmpl
@@ -1,7 +1,7 @@
 User-agent: *
 Disallow: /
 
-{{ if eq $PB_PUBLIC_DIRECTORY "true" }}
+{{ if eq (env "PB_PUBLIC_DIRECTORY") "true" }}
 User-agent: PrivateBinDirectoryBot
 Disallow: /
 {{ else }}