diff --git a/.travis.yml b/.travis.yml
index 2690a66..45afd5b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,4 +6,4 @@ compiler:
 script: ./autogen.sh && ./configure && make && make check && make distcheck
 before_install:
   - sudo apt-get -qq update
-  - sudo apt-get -q install autoconf automake autopoint libtool gettext idn2 libidn2-0 libidn2-0-dev
+  - sudo apt-get -q install autoconf automake autopoint libtool gtk-doc-tools gettext idn2 libidn2-0 libidn2-0-dev