diff --git a/src/default.nix b/src/default.nix
index 424a1fab..95eae695 100644
--- a/src/default.nix
+++ b/src/default.nix
@@ -433,7 +433,7 @@ in let
           // rec {
             dreamLock =
               (utils.readDreamLock {
-                dreamLock = "${config.projectRoot}/${project.dreamLockPath}";
+                dreamLock = "${toString config.projectRoot}/${project.dreamLockPath}";
               })
               .lock;
             impure = isImpure project translator;