diff --git a/graphene_django/converter.py b/graphene_django/converter.py
index c7c5cd6..09c5583 100644
--- a/graphene_django/converter.py
+++ b/graphene_django/converter.py
@@ -31,6 +31,8 @@ singledispatch = import_single_dispatch()
 def convert_choice_name(name):
     name = force_text(name).encode('utf8').decode('ascii', 'ignore')
     name = to_const(name)
+    if name.startswith('_'):
+        name = "A%s" % name
     try:
         assert_valid_name(name)
     except AssertionError:
diff --git a/graphene_django/tests/models.py b/graphene_django/tests/models.py
index f54575f..39e626b 100644
--- a/graphene_django/tests/models.py
+++ b/graphene_django/tests/models.py
@@ -4,7 +4,7 @@ from __future__ import absolute_import
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
-CHOICES = ((1, u"1: this漢"), (2, _(u"2: that漢")))
+CHOICES = ((1, u"1: this漢"), (2, _(u"2: that漢")), (3, "__amount__"))
 
 
 class Pet(models.Model):
diff --git a/graphene_django/tests/test_converter.py b/graphene_django/tests/test_converter.py
index c6ee128..466e607 100644
--- a/graphene_django/tests/test_converter.py
+++ b/graphene_django/tests/test_converter.py
@@ -215,6 +215,24 @@ def test_field_with_choices_collision():
     convert_django_field_with_choices(field)
 
 
+def test_field_with_choices_underscore():
+    field = models.CharField(
+        choices=(
+            ("__amount__", "Amount"),
+            ("__percentage__", "Percentage"),
+        ),
+    )
+
+    class UnderscoreChoicesModel(models.Model):
+        ourfield = field
+
+        class Meta:
+            app_label = "test"
+
+    graphene_type = convert_django_field_with_choices(field)
+    assert len(graphene_type._meta.enum.__members__) == 2
+
+
 def test_should_float_convert_float():
     assert_conversion(models.FloatField, graphene.Float)
 
diff --git a/graphene_django/tests/test_types.py b/graphene_django/tests/test_types.py
index 888faf4..25dbfbc 100644
--- a/graphene_django/tests/test_types.py
+++ b/graphene_django/tests/test_types.py
@@ -174,6 +174,7 @@ type Reporter {
 enum ReporterAChoice {
   A_1_THIS
   A_2_THAT
+  A__AMOUNT__
 }
 
 enum ReporterReporterType {