diff --git a/direct/src/deadrec/prediction.cxx b/direct/src/deadrec/prediction.cxx
index 6b56626575..dafd0c755b 100644
--- a/direct/src/deadrec/prediction.cxx
+++ b/direct/src/deadrec/prediction.cxx
@@ -14,7 +14,10 @@ Prediction::~Prediction(void) {
 void Prediction::step(void) {
 }
 
-void Prediction::new_telemetry(LPoint3f& t_pos) {
+void Prediction::new_telemetry(LPoint3f&) {
+}
+
+void Prediction::force_telemetry(LPoint3f&) {
 }
 
 LPoint3f Prediction::get_pos(void) const {
@@ -37,7 +40,11 @@ void NullPrediction::step(void) {
 }
 
 void NullPrediction::new_telemetry(LPoint3f& t_pos) {
-  //  _curr_v = _curr_p - t_pos;
+  _curr_v = t_pos - _curr_p;
+  _curr_p = t_pos;
+}
+
+void NullPrediction::force_telemetry(LPoint3f& t_pos) {
   _curr_v = t_pos - _curr_p;
   _curr_p = t_pos;
 }
@@ -53,5 +60,8 @@ LinearPrediction::~LinearPrediction(void) {
 void LinearPrediction::step(void) {
 }
 
-void LinearPrediction::new_telemetry(LPoint3f& t_pos) {
+void LinearPrediction::new_telemetry(LPoint3f&) {
+}
+
+void LinearPrediction::force_telemetry(LPoint3f&) {
 }
diff --git a/direct/src/deadrec/prediction.h b/direct/src/deadrec/prediction.h
index 06f972631f..df346b27c6 100644
--- a/direct/src/deadrec/prediction.h
+++ b/direct/src/deadrec/prediction.h
@@ -19,6 +19,7 @@ PUBLISHED:
 
   virtual void step(void);
   virtual void new_telemetry(LPoint3f&);
+  virtual void force_telemetry(LPoint3f&);
 
   LPoint3f get_pos(void) const;
   LVector3f get_vel(void) const;
@@ -31,6 +32,7 @@ PUBLISHED:
 
   virtual void step(void);
   virtual void new_telemetry(LPoint3f&);
+  virtual void force_telemetry(LPoint3f&);
 };
 
 class LinearPrediction : public Prediction {
@@ -40,6 +42,7 @@ PUBLISHED:
 
   virtual void step(void);
   virtual void new_telemetry(LPoint3f&);
+  virtual void force_telemetry(LPoint3f&);
 };
 
 #endif /* __PREDICTION_H__ */