diff --git a/elaborate.cc b/elaborate.cc
index 579f2753a..c684b0de1 100644
--- a/elaborate.cc
+++ b/elaborate.cc
@@ -4695,6 +4695,9 @@ class top_defparams : public elaborator_work_item_t {
 
       virtual void elaborate_runrun()
       {
+	    if (debug_scopes) {
+		  cerr << "debug: top_defparams::elaborate_runrun()" << endl;
+	    }
 	      // This method recurses through the scopes, looking for
 	      // defparam assignments to apply to the parameters in the
 	      // various scopes. This needs to be done after all the scopes
@@ -4706,6 +4709,10 @@ class top_defparams : public elaborator_work_item_t {
 	      // scopes and evaluate the parameters all the way down to
 	      // constants.
 	    des->evaluate_parameters();
+
+	    if (debug_scopes) {
+		  cerr << "debug: top_defparams::elaborate_runrun() done" << endl;
+	    }
       }
 };
 
@@ -4719,6 +4726,10 @@ class later_defparams : public elaborator_work_item_t {
 
       virtual void elaborate_runrun()
       {
+	    if (debug_scopes) {
+		  cerr << "debug: later_defparams::elaborate_runrun()" << endl;
+	    }
+
 	    list<NetScope*>tmp_list;
 	    for (set<NetScope*>::iterator cur = des->defparams_later.begin()
 		       ; cur != des->defparams_later.end() ; ++ cur )
@@ -4731,7 +4742,13 @@ class later_defparams : public elaborator_work_item_t {
 		  tmp_list.pop_front();
 		  cur->run_defparams_later(des);
 	    }
-	    des->evaluate_parameters();
+
+	      // The overridden parameters will be evaluated later in
+	      // a top_defparams work item.
+
+	    if (debug_scopes) {
+		  cerr << "debuf: later_defparams::elaborate_runrun() done" << endl;
+	    }
       }
 };
 
diff --git a/net_design.cc b/net_design.cc
index ac5517bd4..0ea857cf4 100644
--- a/net_design.cc
+++ b/net_design.cc
@@ -303,11 +303,9 @@ void NetScope::run_defparams_later(Design*des)
 	    target_scopes.insert(targ_scope);
       }
 
-	// All the scopes that this defparam set touched should have
-	// their parameters re-evaluated.
-      for (set<NetScope*>::iterator cur = target_scopes.begin()
-		 ; cur != target_scopes.end() ; ++ cur )
-	    (*cur)->evaluate_parameters(des);
+	// The scopes that this defparam set touched will be
+	// re-evaluated later it a top_defparams work item. So do not
+	// do the evaluation now.
 
 	// If there are some scopes that still have missing scopes,
 	// then save them back into the defparams_later list for a