diff --git a/lib/types.nix b/lib/types.nix
index 77f32f48ea2..ee891f8231b 100644
--- a/lib/types.nix
+++ b/lib/types.nix
@@ -57,6 +57,9 @@ let
     escapeNixString
     isCoercibleToString
     ;
+  inherit (lib.trivial)
+    boolToString
+    ;
 
   inherit (lib.modules) mergeDefinitions;
   outer_types =