--- a/src/PhysicsObject.cc	Mon Dec 08 00:16:43 2008 +0000
+++ b/src/PhysicsObject.cc	Mon Dec 08 00:36:24 2008 +0000
@@ -133,8 +133,8 @@
     Force total;
     while (!forceq.empty()) {
         force = forceq.front();
-        if (force.second > PHYSICS_TICK_MS) {
-            force.second -= PHYSICS_TICK_MS;
+        if (force.second > dt) {
+            force.second -= dt;
             newfq.push(force);
         }
         total += force.first;