diff --git a/gprMax/contexts.py b/gprMax/contexts.py
index 11ca1a8f..a47a3439 100644
--- a/gprMax/contexts.py
+++ b/gprMax/contexts.py
@@ -83,6 +83,9 @@ class Context:
                 solver = create_solver(G)
                 model.solve(solver)
 
+            del model
+            del solver
+            del G
             gc.collect()
 
         self.tsimend = timer()