diff --git a/django/contrib/gis/db/backends/postgis/creation.py b/django/contrib/gis/db/backends/postgis/creation.py
index 4f64ecce29..51ac197b8e 100644
--- a/django/contrib/gis/db/backends/postgis/creation.py
+++ b/django/contrib/gis/db/backends/postgis/creation.py
@@ -89,7 +89,7 @@ class PostGISCreation(DatabaseCreation):
             self.connection.close()
             self.connection.settings_dict["NAME"] = test_database_name
             cursor = self.connection.cursor()
-            cursor.execute("CREATE EXTENSION postgis")
+            cursor.execute("CREATE EXTENSION IF NOT EXISTS postgis")
             cursor.connection.commit()
 
         return test_database_name