diff --git a/lug-helper.sh b/lug-helper.sh
index 20a77d0..59e9f61 100755
--- a/lug-helper.sh
+++ b/lug-helper.sh
@@ -979,6 +979,8 @@ preflight_check() {
     unset preflight_results
     unset preflight_manual
     unset preflight_followup
+    unset preflight_fail_string
+    unset preflight_pass_string
 
     # Call the optimization functions to perform the checks
     lutris_check