diff --git a/Makefile b/Makefile
index 40d7f17..68abafa 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ debug:
 	ocamlbuild -use-ocamlfind -I src oboy.d.byte
 
 check:
-	ocamlbuild -use-ocamlfind -I src -lflag -g test/test_cpu.byte --
+	ocamlbuild -use-ocamlfind -I src -lflag -g test/test_bit.byte --
 
 clean:
 	rm -rf _build
diff --git a/test/test_cpu.ml b/test/test_bit.ml
similarity index 87%
rename from test/test_cpu.ml
rename to test/test_bit.ml
index ea6790b..a934154 100644
--- a/test/test_cpu.ml
+++ b/test/test_bit.ml
@@ -3,7 +3,7 @@ open OUnit2
 
 let test_signed test_ctx =
   let n = 0xFA in
-  let s = Cpu.signed_byte n in
+  let s = Bit.signed_byte n in
   assert_equal s (-6)
 
 
@@ -16,4 +16,3 @@ let suite =
 
 let () =
   run_test_tt_main suite
-