diff --git a/vvp/part.cc b/vvp/part.cc
index 1dcc38735..51fe5395b 100644
--- a/vvp/part.cc
+++ b/vvp/part.cc
@@ -86,11 +86,8 @@ void vvp_fun_part_sa::recv_vec4_pv(vvp_net_ptr_t port, const vvp_vector4_t&bit,
 {
       assert(bit.size() == wid);
 
-      vvp_vector4_t tmp = val_;
-      if (tmp.size() == 0)
-	    tmp = vvp_vector4_t(vwid);
-
-      assert(tmp.size() == vwid);
+      vvp_vector4_t tmp (vwid, BIT4_X);
+      tmp.set_vec(base_, val_);
       tmp.set_vec(base, bit);
       recv_vec4(port, tmp, 0);
 }
@@ -179,11 +176,8 @@ void vvp_fun_part_aa::recv_vec4_pv(vvp_net_ptr_t port, const vvp_vector4_t&bit,
             vvp_vector4_t*val = static_cast<vvp_vector4_t*>
                   (vvp_get_context_item(context, context_idx_));
 
-            vvp_vector4_t tmp = *val;
-            if (tmp.size() == 0)
-                  tmp = vvp_vector4_t(vwid);
-
-            assert(tmp.size() == vwid);
+            vvp_vector4_t tmp (vwid, BIT4_X);
+            tmp.set_vec(base_, *val);
             tmp.set_vec(base, bit);
             recv_vec4(port, tmp, context);
       } else {