diff --git a/src/wagtail_2fa/forms.py b/src/wagtail_2fa/forms.py
index 4cb5b34..2fcc17b 100644
--- a/src/wagtail_2fa/forms.py
+++ b/src/wagtail_2fa/forms.py
@@ -1,3 +1,5 @@
+import re
+
 from django import forms
 from django.contrib.auth import authenticate
 from django.utils.translation import gettext_lazy as _
@@ -16,6 +18,12 @@ def __init__(self, user, *args, **kwargs):
             {"autofocus": "autofocus", "autocomplete": "off"}
         )
 
+    def clean_otp_token(self):
+        '''Remove whitespace because authentication apps often present token
+        as "123 456". It is very confusing for user if this exact format
+        isn't supported.'''
+        return re.sub(r'\s', '', self.cleaned_data.get('otp_token', ''))
+
     def clean(self):
         self.clean_otp(self.user)
         return self.cleaned_data