diff --git a/lib/default.nix b/lib/default.nix
index 9dc4fea99fc..3e30ec515fc 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -41,6 +41,7 @@ let
     generators = callLibs ./generators.nix;
     misc = callLibs ./deprecated.nix;
     # domain-specific
+    sandbox = callLibs ./sandbox.nix;
     fetchers = callLibs ./fetchers.nix;
 
     # Eval-time filesystem handling