diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index 1050a0d591..b9049001e0 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -784,8 +784,7 @@ class ModelAdmin(BaseModelAdmin):
         """
         # If self.actions is explicitly set to None that means that we don't
         # want *any* actions enabled on this page.
-        from django.contrib.admin.views.main import _is_changelist_popup
-        if self.actions is None or _is_changelist_popup(request):
+        if self.actions is None or IS_POPUP_VAR in request.GET:
             return OrderedDict()
 
         actions = []
diff --git a/django/contrib/admin/views/main.py b/django/contrib/admin/views/main.py
index 4433a7ec2a..d1b6d82a3e 100644
--- a/django/contrib/admin/views/main.py
+++ b/django/contrib/admin/views/main.py
@@ -1,6 +1,5 @@
 from collections import OrderedDict
 import sys
-import warnings
 
 from django.core.exceptions import SuspiciousOperation, ImproperlyConfigured
 from django.core.paginator import InvalidPage
@@ -8,7 +7,6 @@ from django.core.urlresolvers import reverse
 from django.db import models
 from django.db.models.fields import FieldDoesNotExist
 from django.utils import six
-from django.utils.deprecation import RemovedInDjango18Warning
 from django.utils.encoding import force_text
 from django.utils.translation import ugettext, ugettext_lazy
 from django.utils.http import urlencode
@@ -34,29 +32,6 @@ IGNORED_PARAMS = (
 EMPTY_CHANGELIST_VALUE = ugettext_lazy('(None)')
 
 
-def _is_changelist_popup(request):
-    """
-    Returns True if the popup GET parameter is set.
-
-    This function is introduced to facilitate deprecating the legacy
-    value for IS_POPUP_VAR and should be removed at the end of the
-    deprecation cycle.
-    """
-
-    if IS_POPUP_VAR in request.GET:
-        return True
-
-    IS_LEGACY_POPUP_VAR = 'pop'
-    if IS_LEGACY_POPUP_VAR in request.GET:
-        warnings.warn(
-            "The `%s` GET parameter has been renamed to `%s`." %
-            (IS_LEGACY_POPUP_VAR, IS_POPUP_VAR),
-            RemovedInDjango18Warning, 2)
-        return True
-
-    return False
-
-
 class ChangeList(object):
     def __init__(self, request, model, list_display, list_display_links,
             list_filter, date_hierarchy, search_fields, list_select_related,
@@ -82,7 +57,7 @@ class ChangeList(object):
         except ValueError:
             self.page_num = 0
         self.show_all = ALL_VAR in request.GET
-        self.is_popup = _is_changelist_popup(request)
+        self.is_popup = IS_POPUP_VAR in request.GET
         self.to_field = request.GET.get(TO_FIELD_VAR)
         self.params = dict(request.GET.items())
         if PAGE_VAR in self.params: