diff --git a/src/propeller/problems/PSB1/grade.cljc b/src/propeller/problems/PSB1/grade.cljc
index b2f2590..53b1e79 100644
--- a/src/propeller/problems/PSB1/grade.cljc
+++ b/src/propeller/problems/PSB1/grade.cljc
@@ -3,7 +3,6 @@
    [psb2.core :as psb2]
    [propeller.genome :as genome]
    [propeller.push.interpreter :as interpreter]
-   [propeller.problems.data-creation :as dc]
    [propeller.push.state :as state]
    [propeller.push.instructions :refer [get-stack-instructions]]
    [propeller.utils :as utils]