diff --git a/.travis.yml b/.travis.yml
index e32dfc8beb26d347dabb3486309e6f2a9ed1bf42..8806fee3ed4bff995b820ef708748573ce9f90b6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,7 +58,8 @@ script:
   - cd $TRAVIS_BUILD_DIR/unittest/cmake
   - mkdir build
   - cd build
-  - cmake .. 
+  - export CMAKE_PREFIX_PATH=/tmp/_ci/install
+  - cmake ..
   - make
   - ./extra_lib
   - cd /tmp/_ci/build