diff --git a/Makefile b/Makefile
index c586a411..39fceab8 100644
--- a/Makefile
+++ b/Makefile
@@ -5,12 +5,9 @@ all: build test
 build:
 	@dune build @install
 
-test: tests/foo_50
+test:
 	@dune runtest --no-buffer --force
 
-tests/foo_50:
-	dd if=/dev/zero of=$@ bs=1M count=50
-
 clean:
 	@dune clean
 
diff --git a/tests/dune b/tests/dune
index 37621ada..48277535 100644
--- a/tests/dune
+++ b/tests/dune
@@ -40,3 +40,9 @@
 (rule
   (alias runtest)
   (action (diff dl-out.expect dl-out)))
+
+
+(rule
+  (targets foo_50)
+  (action
+    (bash "dd if=/dev/zero of=%{targets} bs=1M count=50")))