diff --git a/script/local.py b/script/local.py
index 06e7273..c84b046 100644
--- a/script/local.py
+++ b/script/local.py
@@ -273,7 +273,7 @@ def has_beam():
 
 def wait_beam():
     print "Waiting for beam..."
-    while ! has_beam():
+    while not has_beam():
         print 'X'
         sleep(0.1)
     print "Beam OK"