diff --git a/riscv_ctg/generator.py b/riscv_ctg/generator.py
index 308ea46..894ee0a 100644
--- a/riscv_ctg/generator.py
+++ b/riscv_ctg/generator.py
@@ -264,7 +264,7 @@ def __init__(self,fmt,opnode,opcode,randomization, xl, fl, ifl ,base_isa_str):
         self.is_fext = is_fext
         self.is_nan_box = is_nan_box
 
-        if opcode in ['sw', 'sh', 'sb', 'lw', 'lhu', 'lh', 'lb', 'lbu', 'ld', 'lwu', 'sd',"jal","beq","bge","bgeu","blt","bltu","bne","jalr","c.jalr","c.jr","flw","fsw","fld","fsd"]:
+        if opcode in ['sw', 'sh', 'sb', 'lw', 'lhu', 'lh', 'lb', 'lbu', 'ld', 'lwu', 'sd',"jal","beq","bge","bgeu","blt","bltu","bne","jalr","c.jalr","c.jr","flw","fsw","fld","fsd","ldz","sdz"]:
             self.val_vars = self.val_vars + ['ea_align']
         self.template = opnode['template']
         self.opnode = opnode