diff --git a/korman/exporter/physics.py b/korman/exporter/physics.py
index cd95698..e0e52c6 100644
--- a/korman/exporter/physics.py
+++ b/korman/exporter/physics.py
@@ -74,10 +74,6 @@ class PhysicsConverter:
             simIface = self._mgr.add_object(pl=plSimulationInterface, bl=bo)
             physical = self._mgr.add_object(pl=plGenericPhysical, bl=bo, name=name)
 
-            # libHSPlasma's default mass is evil. The issue is that CWE will only do PhysAnim
-            # aka non dynamic animated physicals if the mass != 0. The user can override this.
-            physical.mass = 1.0
-
             simIface.physical = physical.key
             physical.object = so.key
             physical.sceneNode = self._mgr.get_scene_node(bl=bo)
diff --git a/korman/properties/modifiers/anim.py b/korman/properties/modifiers/anim.py
index cff916e..dfce8c8 100644
--- a/korman/properties/modifiers/anim.py
+++ b/korman/properties/modifiers/anim.py
@@ -137,6 +137,10 @@ class PlasmaAnimationModifier(PlasmaModifierProperties):
             phys = sim.physical.object
             phys.setProperty(plSimulationInterface.kPhysAnim, True)
 
+            # If the mass is zero, then we will fail to animate. Fix that.
+            if phys.mass == 0.0:
+                phys.mass = 1.0
+
 
 class LoopMarker(bpy.types.PropertyGroup):
     loop_name = StringProperty(name="Loop Name",