diff --git a/src/mini-cc/tests/dune b/src/mini-cc/tests/dune
index 6b0fb30d..988a0170 100644
--- a/src/mini-cc/tests/dune
+++ b/src/mini-cc/tests/dune
@@ -2,5 +2,6 @@
  (names tests)
  (libraries sidekick.mini-cc sidekick-base alcotest)
  (package sidekick-base)
+ (flags :standard -warn-error -a+8 -safe-string -color always)
  (locks /test)
  (modes native))
diff --git a/src/mini-cc/tests/tests.ml b/src/mini-cc/tests/tests.ml
index 8f6326af..291d0d58 100644
--- a/src/mini-cc/tests/tests.ml
+++ b/src/mini-cc/tests/tests.ml
@@ -1,4 +1,3 @@
-open Sidekick_util
 open Sidekick_base
 
 module A = Alcotest