diff --git a/questionable.nimble b/questionable.nimble
index c79337a..7a6f45e 100644
--- a/questionable.nimble
+++ b/questionable.nimble
@@ -6,5 +6,6 @@ license = "MIT"
 task test, "Runs the test suite":
   for module in ["options", "result", "stew"]:
     withDir "testmodules/" & module:
+      delEnv "NIMBLE_DIR" # use nimbledeps dir
       exec "nimble install -d -y"
       exec "nimble test -y"