diff --git a/apps/amo/utils.py b/apps/amo/utils.py
index c6cd952697..34a80b7196 100644
--- a/apps/amo/utils.py
+++ b/apps/amo/utils.py
@@ -26,9 +26,9 @@ from django.core import paginator
 from django.core.cache import cache
 from django.core.files.storage import (FileSystemStorage,
                                        default_storage as storage)
-from django.core.serializers import json
-from django.core.validators import ValidationError, validate_slug
 from django.core.mail import EmailMessage, EmailMultiAlternatives
+from django.core.serializers import json
+from django.core.validators import validate_slug, ValidationError
 from django.forms.fields import Field
 from django.http import HttpRequest
 from django.template import Context, loader
@@ -38,14 +38,14 @@ from django.utils.functional import Promise
 from django.utils.http import urlquote
 
 import bleach
-from cef import log_cef as _log_cef
-from django_statsd.clients import statsd
 import elasticutils.contrib.django as elasticutils
 import html5lib
 import jinja2
 import pyes.exceptions as pyes
 import pytz
 from babel import Locale
+from cef import log_cef as _log_cef
+from django_statsd.clients import statsd
 from easy_thumbnails import processors
 from html5lib.serializer.htmlserializer import HTMLSerializer
 from jingo import env
@@ -240,7 +240,8 @@ def send_mail(subject, message, from_email=None, recipient_list=None,
                     'perm_setting': perm_setting.label,
                     'SITE_URL': settings.SITE_URL,
                     'mandatory': perm_setting.mandatory,
-                    # Hide "Unsubscribe" links in Marketplace emails (bug 802379).
+                    # Hide "Unsubscribe" links in Marketplace emails
+                    # (bug 802379).
                     'show_unsubscribe': not settings.MARKETPLACE
                 }
                 # Render this template in the default locale until
@@ -591,7 +592,7 @@ def get_locale_from_lang(lang):
     """Pass in a language (u'en-US') get back a Locale object courtesy of
     Babel.  Use this to figure out currencies, bidi, names, etc."""
     # Special fake language can just act like English for formatting and such
-    if lang == 'dbg':
+    if not lang or lang == 'dbg':
         lang = 'en'
     return Locale(translation.to_locale(lang))
 
diff --git a/apps/stats/models.py b/apps/stats/models.py
index 1a94e915db..bca81d2239 100644
--- a/apps/stats/models.py
+++ b/apps/stats/models.py
@@ -5,18 +5,18 @@ from django.db import models
 from django.template import Context, loader
 from django.utils import translation
 
-from babel import Locale, numbers
 import caching.base
+import tower
+from babel import Locale, numbers
 from jingo import env
 from jinja2.filters import do_dictsort
-import tower
 from tower import ugettext as _
 
 import amo
 from amo.helpers import absolutify, urlparams
 from amo.models import SearchMixin
 from amo.fields import DecimalCharField
-from amo.utils import send_mail, send_mail_jinja
+from amo.utils import get_locale_from_lang, send_mail, send_mail_jinja
 from zadmin.models import DownloadSource
 
 from .db import StatsDictField
@@ -355,7 +355,7 @@ class Contribution(amo.models.ModelBase):
         """Localise the amount paid into the current locale."""
         if not locale:
             lang = translation.get_language()
-            locale = Locale(translation.to_locale(lang))
+            locale = get_locale_from_lang(lang)
         return numbers.format_currency(self.amount or 0,
                                        self.currency or 'USD',
                                        locale=locale)
diff --git a/mkt/purchase/tests/test_webpay_tasks.py b/mkt/purchase/tests/test_webpay_tasks.py
index 2329897675..ae357fb304 100644
--- a/mkt/purchase/tests/test_webpay_tasks.py
+++ b/mkt/purchase/tests/test_webpay_tasks.py
@@ -73,7 +73,8 @@ class TestReceiptEmail(PurchaseTest):
                                                    amount=self.price.price,
                                                    uuid=str(uuid.uuid4()),
                                                    type=amo.CONTRIB_PURCHASE,
-                                                   user=self.user)
+                                                   user=self.user,
+                                                   source_locale='en-us')
 
     def test_send(self):
         tasks.send_purchase_receipt(self.contrib.pk)
@@ -97,6 +98,5 @@ class TestReceiptEmail(PurchaseTest):
         eq_(args[1]['recipient_list'], [self.user.email])
         eq_(data['app_name'], self.addon.name)
         eq_(data['developer_name'], self.addon.current_version.developer_name)
-        eq_(data['price'],
-            self.contrib.get_amount_locale(self.contrib.source_locale))
+        eq_(data['price'], self.contrib.get_amount_locale('en_US'))
         ok_(data['purchases_url'].startswith('http://f.com'))
diff --git a/mkt/purchase/webpay_tasks.py b/mkt/purchase/webpay_tasks.py
index 3fedfe59a5..87bb77e9f6 100644
--- a/mkt/purchase/webpay_tasks.py
+++ b/mkt/purchase/webpay_tasks.py
@@ -8,7 +8,7 @@ import amo
 from amo.decorators import write
 from amo.helpers import absolutify
 from amo.urlresolvers import reverse
-from amo.utils import send_html_mail_jinja
+from amo.utils import get_locale_from_lang, send_html_mail_jinja
 from mkt.inapp_pay.models import InappConfig
 from mkt.inapp_pay.utils import send_pay_notice
 from stats.models import Contribution
@@ -74,7 +74,8 @@ def send_purchase_receipt(contrib_id, **kw):
         data = {
             'app_name': addon.name,
             'developer_name': version.developer_name if version else '',
-            'price': contrib.get_amount_locale(contrib.source_locale),
+            'price': contrib.get_amount_locale(get_locale_from_lang(
+                contrib.source_locale)),
             'date': datetime(contrib.created.date()),
             'purchaser_email': contrib.user.email,
             #'purchaser_phone': '',  # TODO: See bug 894614.