diff --git a/external/external_build.cmake b/external/external_build.cmake
index 5032b35..a38fc1d 100644
--- a/external/external_build.cmake
+++ b/external/external_build.cmake
@@ -128,6 +128,7 @@ else (INTERNAL_HDF5)
       endif()
     endforeach()
     cmessage(STATUS "HDF5 libpath: ${HDF5_BIN_DIR}")
+    SET(HDF5_INCLUDE_DIR ${HDF5_INCLUDE_DIRS})
   else()
     cmessage(STATUS "Found HDF5 cmake config.")
     cmessage(STATUS "HDF5_C_STATIC_LIBRARY : ${HDF5_C_STATIC_LIBRARY}")