diff --git a/edo/CMakeLists.txt b/edo/CMakeLists.txt
index 1c721097d..50424db45 100644
--- a/edo/CMakeLists.txt
+++ b/edo/CMakeLists.txt
@@ -10,7 +10,7 @@ if(EDO_USE_LIB STREQUAL "uBLAS")
 elseif(EDO_USE_LIB STREQUAL "Eigen3")
     find_package(Eigen3)
     if(EIGEN3_FOUND)
-        include_directories(EIGEN3_INCLUDE_DIR)
+        include_directories( ${EIGEN3_INCLUDE_DIR} )
         add_definitions( -DWITH_EIGEN )
     else()
         message(FATAL_ERROR  "\n\nERROR: You asked for Eigen3 but it has not been found.\n" )