diff --git a/CMakeLists.txt b/CMakeLists.txt
index df050b4..41d30c1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -81,6 +81,7 @@
 add_subdirectory(Eigen)
 
 if(EIGEN_BUILD_TESTS)
+  include(CTest)
   add_subdirectory(test)
 endif(EIGEN_BUILD_TESTS)