diff --git a/buttond.py b/buttond.py
index 91a337b..e7442c7 100755
--- a/buttond.py
+++ b/buttond.py
@@ -69,6 +69,7 @@ for b in config.get('button', 'names').split(','):
 # clear temp variables off the stack
 try:
     del pin, closed, opened
+    del c, config
 except NameError as e:
     print('failed to release memory', e)