diff --git a/Makefile b/Makefile
index f777d40ded..c1f5943d07 100644
--- a/Makefile
+++ b/Makefile
@@ -63,5 +63,8 @@ test:
 	dune build @src/fmt @test/fmt --auto-promote src test --profile dev
 	node $(TEST_DIR)/haz3ltest.bc.js
 
+watch-test:
+	dune build @fmt @runtest --auto-promote --watch
+
 clean:
 	dune clean