diff --git a/companion/src/cmake/Macros.cmake b/companion/src/cmake/Macros.cmake
index 7ac492b8b..1dcf82587 100644
--- a/companion/src/cmake/Macros.cmake
+++ b/companion/src/cmake/Macros.cmake
@@ -26,10 +26,10 @@ ENDMACRO (NOW)
 
 MACRO (GIT_ID RESULT)
     IF (WIN32)
-        EXECUTE_PROCESS(COMMAND "cmd" " /C git -C ${RADIO_SRC_DIRECTORY} rev-parse HEAD" OUTPUT_VARIABLE ${RESULT})
+        EXECUTE_PROCESS(COMMAND "cmd" " /C git --git-dir=${PROJECT_SOURCE_DIR}/../../.git rev-parse HEAD" OUTPUT_VARIABLE ${RESULT})
         string(REGEX REPLACE "(..):(..).*" "\\1:\\2:00" ${RESULT} ${${RESULT}})
     ELSEIF(UNIX)
-        EXECUTE_PROCESS(COMMAND "git" "-C" "${RADIO_SRC_DIRECTORY}" "rev-parse" "HEAD" OUTPUT_VARIABLE ${RESULT})
+        EXECUTE_PROCESS(COMMAND "git" "--git-dir=${PROJECT_SOURCE_DIR}/../../.git" "rev-parse" "HEAD" OUTPUT_VARIABLE ${RESULT})
         string(REGEX REPLACE "(.*)\n" "\\1" ${RESULT} ${${RESULT}})
     ELSE (WIN32)
         MESSAGE(SEND_ERROR "Git ID implemented")