diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4dc2013c6..eb10c61be 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -122,7 +122,7 @@ if(NOT EO_ONLY)
         add_definitions(-DWITH_MPI)
         set(CMAKE_CXX_COMPILE_FLAGS ${CMAKE_CXX_COMPILE_FLAGS} ${MPI_COMPILE_FLAGS})
         set(CMAKE_CXX_LINK_FLAGS ${CMAKE_CXX_LINK_FLAGS} ${MPI_LINK_FLAGS})
-        include_directories(MPI_INCLUDE_PATH)
+        include_directories(${MPI_INCLUDE_PATH})
         add_subdirectory(${MPI_SRC_DIR})
     endif()
 endif()