diff --git a/tests/unit/models_exps_er_2d.jl b/tests/unit/models_exps_er_2d.jl
index 37198e9a89e3dd69b5bd838643ee3f49d7dab04e..52fcb71924d1f905ee218c5b71b8bc7dcc4a07cf 100644
--- a/tests/unit/models_exps_er_2d.jl
+++ b/tests/unit/models_exps_er_2d.jl
@@ -7,6 +7,7 @@ load_automaton("automaton_F")
 load_automaton("automaton_G")
 load_automaton("automaton_G_and_F")
 
+A_F_R4 = create_automaton_F(ER, 5.0, 15.0, 8.0, 10.0, :P)
 x1, x2, t1, t2 = 50.0, 100.0, 0.0, 0.8
 A_G_R5 = create_automaton_G(ER, x1, x2, t1, t2, :E) 
 x3, x4, t3, t4 = 30.0, 100.0, 0.8, 0.9