diff --git a/Makefile b/Makefile
index fa9f3be1e5..67f55e27d3 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-ISTANBUL_CMD = node_modules/istanbul/lib/cli.js
+ISTANBUL_CMD = node_modules/istanbul/lib/cli.js cover
 MOCHA_CMD = node_modules/mocha/bin/_mocha
 
 export NODE_ENV = test
@@ -13,7 +13,7 @@ test:
 
 test-cov:
 	make clean
-	node $(ISTANBUL_CMD) cover $(MOCHA_CMD) --
+	node $(ISTANBUL_CMD) $(MOCHA_CMD) --
 
 test-travis:
 	node $(ISTANBUL_CMD) $(MOCHA_CMD) --report lcovonly -- --reporter spec