diff --git a/buttond.py b/buttond.py
index e8e818b..1f2691b 100755
--- a/buttond.py
+++ b/buttond.py
@@ -63,6 +63,12 @@ for b in config.get('button', 'names').split(','):
         print('Error configuring button', b, e)
         continue
 
+try:
+    # clear temp variables off the stack
+    del pin, closed, opened
+except (NameError):
+    pass
+
 if __name__ == '__main__':
     try:
         pause()