diff --git a/Makefile b/Makefile
index 28c95b0..9f8d2cb 100644
--- a/Makefile
+++ b/Makefile
@@ -36,7 +36,7 @@ test-browser: lint
 
 cover:
 	rm -rf cover
-	istanbul cover node_modules/.bin/_mocha -- -t 30000 -R spec
+	istanbul cover node_modules/.bin/_mocha
 
 doc:
 	rm -rf ./doc
diff --git a/test/mocha.opts b/test/mocha.opts
index ec648f2..4ac2c1c 100644
--- a/test/mocha.opts
+++ b/test/mocha.opts
@@ -1 +1 @@
--R spec
+-R spec -t 60000