diff --git a/django/db/backends/oracle/introspection.py b/django/db/backends/oracle/introspection.py
index 1ccbd28599..b8a8b2e2c1 100644
--- a/django/db/backends/oracle/introspection.py
+++ b/django/db/backends/oracle/introspection.py
@@ -83,7 +83,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
 
         relations = {}
         for row in cursor.fetchall():
-            relations[row[0]] = (row[2], row[1])
+            relations[row[0]] = (row[2], row[1].lower())
         return relations
 
     def get_indexes(self, cursor, table_name):