diff --git a/Makefile b/Makefile
index 59c70948d..e6bb8959f 100644
--- a/Makefile
+++ b/Makefile
@@ -132,7 +132,9 @@ test-js-watch: .build/deps-build-node.ok
 	@# hitting issues with jest --watch due to
 	@# https://github.com/facebook/jest/issues/3436
 	@# use onchange for now
-	cd ui && ./node_modules/onchange/cli.js 'src/*.js' 'src/**/*.js' -- npm test -- --coverage
+	cd ui && ./node_modules/onchange/cli.js 'src/*.js' 'src/**/*.js' -- \
+		npm test -- \
+			--coverage --coverageReporters=lcov --onlyChanged
 
 .PHONY: test
 test: lint test-go test-js