diff --git a/src/ast/sls/sls_arith_base.cpp b/src/ast/sls/sls_arith_base.cpp
index c16d44c4b..0b5f47548 100644
--- a/src/ast/sls/sls_arith_base.cpp
+++ b/src/ast/sls/sls_arith_base.cpp
@@ -642,7 +642,7 @@ namespace sls {
 
 
 
-#if 1      
+#if 0      
         if (!check_update(v, new_value))
             return false;
         apply_checked_update();