diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 3b893fed1..e887ca306 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -944,7 +944,7 @@ class FloatField(Field):
 
     def to_internal_value(self, data):
 
-        if isinstance(data, six.text_type):
+        if isinstance(data, six.string_types):
 
             data = smart_text(data).strip()