diff --git a/lang/src/codegen.asm b/lang/src/codegen.asm
index efa0d5f..1146f5d 100644
--- a/lang/src/codegen.asm
+++ b/lang/src/codegen.asm
@@ -441,19 +441,14 @@ codegen_free_operand:
     mov [rsp + 8], rsi          ; operand
 
     mov al, byte [rsi]          ; Operand.kind
-    xor rbx, rbx
     cmp al, OPERAND_REGISTER
-    sete bl
+    je .free_reg
     cmp al, OPERAND_REGISTER_PLACE
-    sete bl
-    test bl, bl
-    jnz .free_reg
+    je .free_reg
     cmp al, OPERAND_RBP_VALUE
-    sete bl
+    je .free_stack
     cmp al, OPERAND_RBP_PLACE
-    sete bl
-    test bl, bl
-    jnz .free_stack
+    je .free_stack
     jmp .done
 
 .free_stack: