diff --git a/vvp/vvp_net.cc b/vvp/vvp_net.cc
index a15e55b77..a0d3b6ca2 100644
--- a/vvp/vvp_net.cc
+++ b/vvp/vvp_net.cc
@@ -216,14 +216,14 @@ vvp_net_fil_t::prop_t vvp_net_fil_t::filter_vec8(const vvp_vector8_t&val, vvp_ve
       return PROP;
 }
 
-bool vvp_net_fil_t::filter_real(double&)
+vvp_net_fil_t::prop_t vvp_net_fil_t::filter_real(double&)
 {
-      return true;
+      return PROP;
 }
 
-bool vvp_net_fil_t::filter_long(long&)
+vvp_net_fil_t::prop_t vvp_net_fil_t::filter_long(long&)
 {
-      return true;
+      return PROP;
 }
 
 void vvp_net_fil_t::force_mask(vvp_vector2_t mask)
diff --git a/vvp/vvp_net.h b/vvp/vvp_net.h
index 58dc1bfe5..5d8ef49ac 100644
--- a/vvp/vvp_net.h
+++ b/vvp/vvp_net.h
@@ -1130,8 +1130,8 @@ class vvp_net_fil_t  : public vvp_vpi_callback {
 	// filter, or overridden by the rep argument if present.
       virtual prop_t filter_vec4(const vvp_vector4_t&bit, vvp_vector4_t&rep);
       virtual prop_t filter_vec8(const vvp_vector8_t&val, vvp_vector8_t&rep);
-      virtual bool filter_real(double&val);
-      virtual bool filter_long(long&val);
+      virtual prop_t filter_real(double&val);
+      virtual prop_t filter_long(long&val);
 
       virtual void release(vvp_net_ptr_t ptr, bool net_flag) =0;
       virtual void release_pv(vvp_net_ptr_t ptr, unsigned base, unsigned wid) =0;
@@ -1165,10 +1165,9 @@ class vvp_net_fil_t  : public vvp_vpi_callback {
 	// method will use to hold a filtered value, if needed. This
 	// method returns a pointer to val or buf.
       template <class T> prop_t filter_mask_(const T&val, const T&force, T&rep);
-	// This template method is a scalar value of the above. It
-	// leaves the val, or it replaces it iwth a forced value.
-	// (Not really implemented, yet.)
-      template <class T> bool filter_mask_(T&val);
+	// This template method is similar to the above, but works for
+	// native types that are not so expensive to edit in place.
+      template <class T> prop_t filter_mask_(T&val, T force);
 
     private:
 	// Mask of forced bits
diff --git a/vvp/vvp_net_sig.cc b/vvp/vvp_net_sig.cc
index 4ae71d9e6..63de72f89 100644
--- a/vvp/vvp_net_sig.cc
+++ b/vvp/vvp_net_sig.cc
@@ -59,10 +59,16 @@ template <class T> vvp_net_fil_t::prop_t vvp_net_fil_t::filter_mask_(const T&val
       }
 }
 
-template <class T> bool vvp_net_fil_t::filter_mask_(T&val)
+template <class T> vvp_net_fil_t::prop_t vvp_net_fil_t::filter_mask_(T&val, T force)
 {
+
+      if (test_force_mask(0)) {
+	    val = force;
+	    run_vpi_callbacks();
+	    return REPL;
+      }
       run_vpi_callbacks();
-      return true;
+      return PROP;
 }
 
 vvp_signal_value::~vvp_signal_value()
@@ -814,14 +820,10 @@ vvp_wire_real::vvp_wire_real()
 {
 }
 
-bool vvp_wire_real::filter_real(double&bit)
+vvp_net_fil_t::prop_t vvp_wire_real::filter_real(double&bit)
 {
       bit_ = bit;
-      if (test_force_mask(0)) {
-	    bit = force_;
-	    return false;
-      }
-      return true;
+      return filter_mask_(bit, force_);
 }
 
 unsigned vvp_wire_real::filter_size() const
diff --git a/vvp/vvp_net_sig.h b/vvp/vvp_net_sig.h
index 554887e48..ab3b49af6 100644
--- a/vvp/vvp_net_sig.h
+++ b/vvp/vvp_net_sig.h
@@ -363,7 +363,7 @@ class vvp_wire_real : public vvp_wire_base {
       explicit vvp_wire_real(void);
 
 	// The main filter behavior for this class
-      bool filter_real(double&bit);
+      prop_t filter_real(double&bit);
 
 	// Abstract methods from vvp_vpi_callback
       void get_value(struct t_vpi_value*value);