diff --git a/mix.exs b/mix.exs
index 0183a68..bfbbc87 100755
--- a/mix.exs
+++ b/mix.exs
@@ -27,7 +27,7 @@ defmodule UeberauthVK.Mixfile do
       # Test coverage:
       test_coverage: [tool: ExCoveralls],
       preferred_cli_env: [
-        "coveralls": :test,
+        coveralls: :test,
         "coveralls.detail": :test,
         "coveralls.post": :test,
         "coveralls.html": :test,