diff --git a/git_hash.cmake b/git_hash.cmake
index 9457e60d5..403bfbed1 100644
--- a/git_hash.cmake
+++ b/git_hash.cmake
@@ -4,6 +4,7 @@ set(GIT_HASH "unknown")
 
 if(GIT_FOUND AND EXISTS "${CMAKE_CURRENT_LIST_DIR}/.git")
     execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse HEAD
+                    WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}
                     OUTPUT_VARIABLE GIT_HASH
                     OUTPUT_STRIP_TRAILING_WHITESPACE
                     COMMAND_ERROR_IS_FATAL ANY)