diff --git a/code/CMakeModules/GetRevision.cmake b/code/CMakeModules/GetRevision.cmake
index f760e0420..d7d36fd17 100644
--- a/code/CMakeModules/GetRevision.cmake
+++ b/code/CMakeModules/GetRevision.cmake
@@ -20,7 +20,10 @@ IF(SOURCE_DIR)
   ENDIF()
 ELSE()
   SET(SOURCE_DIR ${CMAKE_SOURCE_DIR})
-  SET(ROOT_DIR ${CMAKE_SOURCE_DIR})
+  SET(ROOT_DIR ${CMAKE_SOURCE_DIR}/..)
+
+  # convert ROOT_DIR to absolute path
+  GET_FILENAME_COMPONENT(ROOT_DIR ${ROOT_DIR} ABSOLUTE)
 ENDIF()
 
 MACRO(NOW RESULT)