diff --git a/direct/src/particles/ParticleEffect.py b/direct/src/particles/ParticleEffect.py
index 6c3dbf4551..25e0343ddb 100644
--- a/direct/src/particles/ParticleEffect.py
+++ b/direct/src/particles/ParticleEffect.py
@@ -158,6 +158,7 @@ class ParticleEffect(NodePath):
         return self.forceGroupDict
 
     def saveConfig(self, filename):
+        filename = Filename(filename)
         f = open(filename.toOsSpecific(), 'wb')
         # Add a blank line
         f.write('\n')