diff --git a/django/contrib/gis/maps/google/gmap.py b/django/contrib/gis/maps/google/gmap.py
index 75b285ca76..ff6562696d 100644
--- a/django/contrib/gis/maps/google/gmap.py
+++ b/django/contrib/gis/maps/google/gmap.py
@@ -134,7 +134,8 @@ class GoogleMap(object):
     @property
     def scripts(self):
         "Returns all <script></script> tags required with Google Maps JavaScript."
-        return format_html('%s\n  <script type="text/javascript">\n//<![CDATA[\n%s//]]>\n  </script>', self.api_script, mark_safe(self.js))
+        return format_html('{0}\n  <script type="text/javascript">\n//<![CDATA[\n{1}//]]>\n  </script>',
+                           self.api_script, mark_safe(self.js))
 
     @property
     def style(self):
diff --git a/django/contrib/gis/tests/geoadmin/tests.py b/django/contrib/gis/tests/geoadmin/tests.py
index c34964a2da..df4158bb31 100644
--- a/django/contrib/gis/tests/geoadmin/tests.py
+++ b/django/contrib/gis/tests/geoadmin/tests.py
@@ -2,9 +2,10 @@ from __future__ import absolute_import
 
 from unittest import skipUnless
 
-from django.test import TestCase
 from django.contrib.gis.geos import HAS_GEOS
 from django.contrib.gis.tests.utils import HAS_SPATIAL_DB
+from django.test import TestCase
+from django.test.utils import override_settings
 
 if HAS_GEOS and HAS_SPATIAL_DB:
     from django.contrib.gis import admin
@@ -12,6 +13,8 @@ if HAS_GEOS and HAS_SPATIAL_DB:
 
     from .models import City
 
+GOOGLE_MAPS_API_KEY = 'XXXX'
+
 
 @skipUnless(HAS_GEOS and HAS_SPATIAL_DB, "Geos and spatial db are required.")
 class GeoAdminTest(TestCase):
@@ -39,7 +42,9 @@ class GeoAdminTest(TestCase):
             result)
 
     def test_olwidget_has_changed(self):
-        """ Check that changes are accurately noticed by OpenLayersWidget. """
+        """
+        Check that changes are accurately noticed by OpenLayersWidget.
+        """
         geoadmin = admin.site._registry[City]
         form = geoadmin.get_changelist_form(None)()
         has_changed = form.fields['point']._has_changed
@@ -55,3 +60,15 @@ class GeoAdminTest(TestCase):
         self.assertFalse(has_changed(initial, data_same))
         self.assertFalse(has_changed(initial, data_almost_same))
         self.assertTrue(has_changed(initial, data_changed))
+
+    @override_settings(GOOGLE_MAPS_API_KEY=GOOGLE_MAPS_API_KEY)
+    def test_google_map_scripts(self):
+        """
+        Testing GoogleMap.scripts() output. See #20773.
+        """
+        from django.contrib.gis.maps.google.gmap import GoogleMap
+
+        google_map = GoogleMap()
+        scripts = google_map.scripts
+        self.assertIn(GOOGLE_MAPS_API_KEY, scripts)
+        self.assertIn("new GMap2", scripts)