diff --git a/.travis.yml b/.travis.yml
index d624ad472..d0ed23756 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,7 +29,7 @@ install:
 
   # Install build dependencies.
   # See also `apt-cache showsrc awesome | grep -E '^(Version|Build-Depends)'`.
-  - sudo apt-get install -y libcairo2-dev xmlto asciidoc libpango1.0-dev libxcb-xtest0-dev libxcb-icccm4-dev libxcb-randr0-dev libxcb-keysyms1-dev libxcb-xinerama0-dev libdbus-1-dev libxdg-basedir-dev libstartup-notification0-dev imagemagick libxcb1-dev libxcb-shape0-dev libxcb-util0-dev libx11-xcb-dev libxcb-cursor-dev libxcb-xkb-dev libxkbcommon-dev libxkbcommon-x11-dev
+  - sudo apt-get install -y libcairo2-dev gtk+3.0 xmlto asciidoc libpango1.0-dev libxcb-xtest0-dev libxcb-icccm4-dev libxcb-randr0-dev libxcb-keysyms1-dev libxcb-xinerama0-dev libdbus-1-dev libxdg-basedir-dev libstartup-notification0-dev imagemagick libxcb1-dev libxcb-shape0-dev libxcb-util0-dev libx11-xcb-dev libxcb-cursor-dev libxcb-xkb-dev libxkbcommon-dev libxkbcommon-x11-dev
 
   # Deps for functional tests.
   - sudo apt-get install -y dbus-x11 xterm xdotool xterm xvfb rxvt-unicode