diff --git a/src/crab/thumb/add_subtract.cr b/src/crab/thumb/add_subtract.cr
index 9dbe05b..380cf9e 100644
--- a/src/crab/thumb/add_subtract.cr
+++ b/src/crab/thumb/add_subtract.cr
@@ -15,7 +15,6 @@ module THUMB
     else
       set_reg(rd, add(@r[rs], operand, true))
     end
-    set_neg_and_zero_flags(@r[rd])
 
     step_thumb
   end