diff --git a/data/formulas/regressions.ltl b/data/formulas/regressions.ltl
index 44eb5b8b907f91a72b2e70f6665c6f664b6af6ac..7efc95bd89aab987d1d950d0497ecfd597b31d2f 100644
--- a/data/formulas/regressions.ltl
+++ b/data/formulas/regressions.ltl
@@ -16,6 +16,7 @@ G (F (a & X (F b)))
 (G a) U (b U (G a))
 (G a) U (b & G F b)
 F (a & (!a | G F b))
+(F a) xor X (b W F a)
 G (G a | (F b & G b))
 G (a | (a U (a U b)))
 G (a | (F (b & X c)))