diff --git a/CMakeLists.txt b/CMakeLists.txt
index 02c72b5..15a947e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -582,7 +582,7 @@ include_directories(
 # Note that this is *not* propagated to clients, ie CERES_INCLUDE_DIRS
 # used by clients after find_package(Ceres) does not identify Eigen as
 # as system headers.
-include_directories(SYSTEM ${EIGEN_INCLUDE_DIRS})
+include_directories(SYSTEM ${EIGEN_INCLUDE_DIRS} ${EIGEN_INCLUDE_DIRS}/Eigen)
 
 if (SUITESPARSE)
   include_directories(${SUITESPARSE_INCLUDE_DIRS})