diff --git a/data_from_portwine/scripts/functions_helper b/data_from_portwine/scripts/functions_helper
index 21876fff..f81d6bfa 100755
--- a/data_from_portwine/scripts/functions_helper
+++ b/data_from_portwine/scripts/functions_helper
@@ -2989,8 +2989,8 @@ start_portwine () {
         export WINEFSYNC_FUTEX2="0"
     else
         export WINEFSYNC="1"
-        export WINEFSYNC_FUTEX2="1"
         export WINEFSYNC_SPINCOUNT=100
+        check_variables WINEFSYNC_FUTEX2 0
     fi
 
     if [[ "${PW_FORCE_LARGE_ADDRESS_AWARE}" == 1 ]]