diff --git a/.travis.yml b/.travis.yml
index 00843732..138b9d9b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -55,6 +55,9 @@ before_script:
   - wget https://github.com/WrinklyNinja/testing-plugins/archive/master.zip
   - unzip master.zip
   - mv testing-plugins-master/* ./
+  # Get the 3rd-party CMake modules.
+  - wget https://raw.githubusercontent.com/rpavlik/cmake-modules/master/GetGitRevisionDescription.cmake
+  - wget https://raw.githubusercontent.com/rpavlik/cmake-modules/master/GetGitRevisionDescription.cmake.in
   # Travis machines are 64 bit, and the deps use dynamic linking.
   - cmake .. -DPROJECT_ARCH=64 -DPROJECT_STATIC_RUNTIME=OFF -DBUILD_SHARED_LIBS=OFF -DGTEST_ROOT=../../gtest-1.7.0