diff --git a/uutlSetHelper.inc b/uutlSetHelper.inc
index fadf6d0..136b0f5 100644
--- a/uutlSetHelper.inc
+++ b/uutlSetHelper.inc
@@ -74,7 +74,7 @@ begin
     if (i in aSet1) and not (i in aSet2) then begin
       result := 1;
       break;
-    end else if not (i in aSet2) and (i in aSet2) then begin
+    end else if not (i in aSet1) and (i in aSet2) then begin
       result := -1;
       break;
     end;