diff --git a/Makefile b/Makefile
index 413254d16f14a82cc0f073a5d7b718366b1d26c9..fc7a1d11d6b957314b431386ded1465d2db218c0 100644
--- a/Makefile
+++ b/Makefile
@@ -23,4 +23,4 @@ clean:
 	make -C tests clean
 
 test: main.native
-	make -C tests
+	OCAMLRUNPARAM=b make -C tests