diff --git a/src/new_rewrite.jl b/src/new_rewrite.jl
index 0e30373..2e0a18c 100644
--- a/src/new_rewrite.jl
+++ b/src/new_rewrite.jl
@@ -139,17 +139,21 @@ function _rewrite(stack::Expr, expr::Expr)
         rhs = if is_mutable
             Expr(:call, MA.operate!!, *, arg1, arg2)
         else
-            Expr(:call, MA.operate!!, MA.add_mul, MA.Zero(), arg1, arg2)
+            Expr(:call, *, arg1, arg2)
         end
         root = gensym()
         push!(stack.args, :($root = $rhs))
         for i in 4:length(expr.args)
             arg, _ = _rewrite(stack, expr.args[i])
-            rhs = Expr(:call, MA.operate!!, *, root, arg)
+            rhs = if is_mutable
+                Expr(:call, MA.operate!!, *, root, arg)
+            else
+                Expr(:call, *, root, arg)
+            end
             root = gensym()
             push!(stack.args, :($root = $rhs))
         end
-        return root, true
+        return root, is_mutable
     elseif expr.args[1] == :.+
         # .+(args...) => add_mul.(add_mul.(arg1, arg2), arg3)
         @assert length(expr.args) > 1