diff --git a/.travis.yml b/.travis.yml
index 6efc8d7056..82e3edb7ad 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,13 +18,14 @@ addons:
             - stunnel4
             - libidn2-0-dev
             - libssh2-1-dev
+            - krb5-user
 
 matrix:
     include:
         - os: linux
           compiler: gcc
           dist: trusty
-          env: T=normal
+          env: T=normal C=--with-gssapi
         - os: linux
           compiler: gcc
           dist: trusty