diff --git a/direct/src/controls/DevWalker.py b/direct/src/controls/DevWalker.py
index 1ecb995c54..de388acdbd 100755
--- a/direct/src/controls/DevWalker.py
+++ b/direct/src/controls/DevWalker.py
@@ -86,6 +86,9 @@ class DevWalker(DirectObject.DirectObject):
     def oneTimeCollide(self):
         pass
 
+    def addBlastForce(self, vector):
+        pass
+
     def displayDebugInfo(self):
         """
         For debug use.
diff --git a/direct/src/controls/GravityWalker.py b/direct/src/controls/GravityWalker.py
index 5f72f63897..cedcb4b6fc 100755
--- a/direct/src/controls/GravityWalker.py
+++ b/direct/src/controls/GravityWalker.py
@@ -419,6 +419,9 @@ class GravityWalker(DirectObject.DirectObject):
             self.setMayJump,
             "jumpDelay-%s"%id(self))
 
+    def addBlastForce(self, vector):
+        self.lifter.addVelocity(vector.length())
+
     def displayDebugInfo(self):
         """
         For debug use.
diff --git a/direct/src/controls/NonPhysicsWalker.py b/direct/src/controls/NonPhysicsWalker.py
index d2cfa5e73a..816d5f174e 100755
--- a/direct/src/controls/NonPhysicsWalker.py
+++ b/direct/src/controls/NonPhysicsWalker.py
@@ -175,6 +175,9 @@ class NonPhysicsWalker(DirectObject.DirectObject):
         tempCTrav.addCollider(self.cRayNodePath, self.lifter)
         tempCTrav.traverse(render)
 
+    def addBlastForce(self, vector):
+        pass
+
     def displayDebugInfo(self):
         """
         For debug use.
diff --git a/direct/src/controls/PhysicsWalker.py b/direct/src/controls/PhysicsWalker.py
index 7e3d654f05..138b07e231 100755
--- a/direct/src/controls/PhysicsWalker.py
+++ b/direct/src/controls/PhysicsWalker.py
@@ -407,6 +407,9 @@ class PhysicsWalker(DirectObject.DirectObject):
                 tempCTrav.addCollider(self.cRayNodePath, self.cRayQueue)
         tempCTrav.traverse(render)
 
+    def addBlastForce(self, vector):
+        pass
+
     def displayDebugInfo(self):
         """
         For debug use.
diff --git a/direct/src/controls/ShipPilot.py b/direct/src/controls/ShipPilot.py
index 50324114f4..e4e1f6ef56 100755
--- a/direct/src/controls/ShipPilot.py
+++ b/direct/src/controls/ShipPilot.py
@@ -497,6 +497,9 @@ class ShipPilot(PhysicsWalker.PhysicsWalker):
                 tempCTrav.addCollider(self.cRayNodePath, self.cRayQueue)
         tempCTrav.traverse(render)
 
+    def addBlastForce(self, vector):
+        pass
+
     def displayDebugInfo(self):
         """
         For debug use.