diff --git a/src/wtforms/fields/simple.py b/src/wtforms/fields/simple.py
index 8692fd40c..0aa8b4253 100644
--- a/src/wtforms/fields/simple.py
+++ b/src/wtforms/fields/simple.py
@@ -40,7 +40,7 @@ def __init__(self, label=None, validators=None, false_values=None, **kwargs):
 
     def process_data(self, value):
         # this will initialize the bool fields with false_values before setting it
-        self.process_formdata([value]) 
+        self.process_formdata([value])
         # self.data = bool(value)
 
     def process_formdata(self, valuelist):