diff --git a/.travis.yml b/.travis.yml
index 5ea29230eb0..a6682e1d048 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,7 @@ addons:
     sources:
     - ubuntu-toolchain-r-test
     packages:
-    - pkg-config netcdf-bin libnetcdf-dev openmpi-bin libopenmpi-dev gfortran
+    - pkg-config netcdf-bin libnetcdf-dev openmpi-bin libopenmpi-dev gfortran doxygen
 
 before_install:
   - test -n $CC && unset CC