diff --git a/script/local.py b/script/local.py
index e85b9a4..2d42160 100644
--- a/script/local.py
+++ b/script/local.py
@@ -83,7 +83,7 @@ def get_geometry():
 def set_geometry(value, apply = None):
     """
     """
-    if value is None or  len(value.strip() == 0):
+    if value is None or  (len(value.strip()) == 0):
         set_setting(GEOMETRY_PREFERENCE, "" )
         for name in "wavelength", "hkl_group", "h", "k", "l":
             dev = get_device(name)