diff --git a/lib/util.nix b/lib/util.nix
index 4b751fa..2b29586 100644
--- a/lib/util.nix
+++ b/lib/util.nix
@@ -20,5 +20,8 @@
     in _accessValueOfFragment attrs fragment
   ;
 
-  toEnvValue = value: if builtins.isBool value then (if value then "true" else "false") else value;
+  toEnvValue = value: with builtins;
+  if isBool value then (if value then "true" else "false")
+  else if isList value then "[${concatStringSep ";" value}]"
+  else value;
 }