diff --git a/gprMax/pml.py b/gprMax/pml.py
index 6b5e8e7d..7414a7d1 100644
--- a/gprMax/pml.py
+++ b/gprMax/pml.py
@@ -214,7 +214,7 @@ class PML:
             self.d = self.G.dz
             self.thickness = self.nz
 
-        self.CFS = []
+        self.CFS = self.G.pmls['cfs']
 
         self.initialise_field_arrays()