diff --git a/vai_reg/symbiyosys.sby b/vai_reg/symbiyosys.sby
index 67f9153..eff8067 100644
--- a/vai_reg/symbiyosys.sby
+++ b/vai_reg/symbiyosys.sby
@@ -6,7 +6,7 @@ mode prove
 #mode cover
 
 [engines]
-smtbmc
+smtbmc --nomem
 #abc pdr
 
 [script]