diff --git a/tests/arch/machxo2/dffs.ys b/tests/arch/machxo2/dffs.ys
index 3e9f87fec..83a07cfee 100644
--- a/tests/arch/machxo2/dffs.ys
+++ b/tests/arch/machxo2/dffs.ys
@@ -8,3 +8,12 @@ design -load postopt # load the post-opt design (otherwise equiv_opt loads the p
 cd dff # Constrain all select calls below inside the top module
 select -assert-count 1 t:FACADE_FF
 select -assert-none t:FACADE_FF %% t:* %D
+
+design -load read
+hierarchy -top dffe
+proc
+equiv_opt -assert -map +/machxo2/cells_sim.v synth_machxo2 # equivalency check
+design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+cd dffe # Constrain all select calls below inside the top module
+select -assert-count 2 t:FACADE_FF t:LUT4
+select -assert-none t:FACADE_FF t:LUT4 %% t:* %D