diff --git a/galpy/orbit_src/integratePlanarOrbit.py b/galpy/orbit_src/integratePlanarOrbit.py
index <HASH>..<HASH> 100644
--- a/galpy/orbit_src/integratePlanarOrbit.py
+++ b/galpy/orbit_src/integratePlanarOrbit.py
@@ -70,6 +70,14 @@ def _parse_pot(pot):
                  and isinstance(p._RZPot,potential.MiyamotoNagaiPotential):
             pot_type.append(5)
             pot_args.extend([p._RZPot._amp,p._RZPot._a,p._RZPot._b])
+        elif isinstance(p,potential.LopsidedDiskPotential):
+            pot_type.append(6)
+            if p._tform is None:
+                pot_args.extend([p._amp,float('nan'), float('nan'),
+                                 p._mphio,p._p,p._phib])
+            else:
+                pot_args.extend([p._amp,p._tform,p._tsteady,
+                                 p._mphio,p._p,p._phib])
     pot_type= nu.array(pot_type,dtype=nu.int32,order='C')
     pot_args= nu.array(pot_args,dtype=nu.float64,order='C')
     return (npot,pot_type,pot_args)
added C extension for LopsidedDiskPotential