diff --git a/rest_framework/authtoken/serializers.py b/rest_framework/authtoken/serializers.py
index 60a3740e7..99e99ae3d 100644
--- a/rest_framework/authtoken/serializers.py
+++ b/rest_framework/authtoken/serializers.py
@@ -1,4 +1,6 @@
 from django.contrib.auth import authenticate
+from django.utils.translation import ugettext_lazy as _
+
 from rest_framework import serializers
 
 
@@ -15,10 +17,13 @@ class AuthTokenSerializer(serializers.Serializer):
 
             if user:
                 if not user.is_active:
-                    raise serializers.ValidationError('User account is disabled.')
+                    msg = _('User account is disabled.')
+                    raise serializers.ValidationError(msg)
                 attrs['user'] = user
                 return attrs
             else:
-                raise serializers.ValidationError('Unable to login with provided credentials.')
+                msg = _('Unable to login with provided credentials.')
+                raise serializers.ValidationError(msg)
         else:
-            raise serializers.ValidationError('Must include "username" and "password"')
+            msg = _('Must include "username" and "password"')
+            raise serializers.ValidationError(msg)