diff --git a/CMakeLists.txt b/CMakeLists.txt
index 614d6fc..9bda5c1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -91,6 +91,7 @@ endif()
 if(NOT DEFINED VERSION OR VERSION STREQUAL "")
   execute_process(
     COMMAND git describe --tags --abbrev=0
+    WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
     OUTPUT_VARIABLE VERSION
     OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET
     RESULT_VARIABLE GIT_RESULT)