diff --git a/src/controllers/application_controller.cr b/src/controllers/application_controller.cr
index 0967557..f21191b 100644
--- a/src/controllers/application_controller.cr
+++ b/src/controllers/application_controller.cr
@@ -3,4 +3,9 @@ require "jasper_helpers"
 class ApplicationController < Amber::Controller::Base
   include JasperHelpers
   LAYOUT = "application.slang"
+
+  # Set content-type to HTML
+  before_action do
+    all { context.response.content_type = "text/html" }
+  end
 end