diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8095465..7ea8f7b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,6 +7,8 @@ if (POLICY CMP0077)
   cmake_policy(SET CMP0077 NEW)
 endif()
 
+set (LIBMETAL_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
+
 list (APPEND CMAKE_MODULE_PATH
       "${CMAKE_CURRENT_SOURCE_DIR}/cmake"
       "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules"
diff --git a/cmake/options.cmake b/cmake/options.cmake
index 4b86616..cbf1c2b 100644
--- a/cmake/options.cmake
+++ b/cmake/options.cmake
@@ -1,4 +1,4 @@
-file(READ ${CMAKE_SOURCE_DIR}/VERSION ver)
+file(READ ${LIBMETAL_ROOT_DIR}/VERSION ver)
 
 string(REGEX MATCH "VERSION_MAJOR = ([0-9]*)" _ ${ver})
 set(PROJECT_VERSION_MAJOR ${CMAKE_MATCH_1})