diff --git a/libmproxy/onboarding/app.py b/libmproxy/onboarding/app.py
index 1df12c7c8..37f05e962 100644
--- a/libmproxy/onboarding/app.py
+++ b/libmproxy/onboarding/app.py
@@ -45,7 +45,7 @@ class PEM(tornado.web.RequestHandler):
     def get(self):
         p = os.path.join(self.request.master.server.config.cadir, self.filename)
         self.set_header("Content-Type", "application/x-x509-ca-cert")
-        self.set_header("Content-Disposition", "attachment; filename={}".format(self.filename))
+        self.set_header("Content-Disposition", "inline; filename={}".format(self.filename))
 
         with open(p, "rb") as f:
             self.write(f.read())
@@ -59,7 +59,7 @@ class P12(tornado.web.RequestHandler):
     def get(self):
         p = os.path.join(self.request.master.server.config.cadir, self.filename)
         self.set_header("Content-Type", "application/x-pkcs12")
-        self.set_header("Content-Disposition", "attachment; filename={}".format(self.filename))
+        self.set_header("Content-Disposition", "inline; filename={}".format(self.filename))
 
         with open(p, "rb") as f:
             self.write(f.read())