diff --git a/test/support/conn_case.ex b/test/support/conn_case.ex
index b50ff1bcc..7ef681258 100644
--- a/test/support/conn_case.ex
+++ b/test/support/conn_case.ex
@@ -58,7 +58,7 @@ defp request_content_type(%{conn: conn}) do
 
       defp empty_json_response(conn) do
         body = response(conn, 204)
-        _ = response_content_type(conn, :json)
+        response_content_type(conn, :json)
 
         body
       end