diff --git a/vai_reg/symbiyosys.sby b/vai_reg/symbiyosys.sby
index c5cca6c..2ce4a7c 100644
--- a/vai_reg/symbiyosys.sby
+++ b/vai_reg/symbiyosys.sby
@@ -6,7 +6,7 @@ mode prove
 
 [engines]
 smtbmc
-#abc pdr
+abc pdr
 
 [script]
 verific -vhdl vai_reg.vhd