diff --git a/rest_framework/schemas/openapi.py b/rest_framework/schemas/openapi.py
index 9774a94c7..f16b3d1e9 100644
--- a/rest_framework/schemas/openapi.py
+++ b/rest_framework/schemas/openapi.py
@@ -516,7 +516,7 @@ class AutoSchema(ViewInspector):
                 continue
 
             if field.required:
-                required.append(field.field_name)
+                required.append(self.get_field_name(field))
 
             schema = self.map_field(field)
             if field.read_only:
@@ -531,7 +531,7 @@ class AutoSchema(ViewInspector):
                 schema['description'] = str(field.help_text)
             self.map_field_validators(field, schema)
 
-            properties[field.field_name] = schema
+            properties[self.get_field_name(field)] = schema
 
         result = {
             'type': 'object',
@@ -582,6 +582,9 @@ class AutoSchema(ViewInspector):
                     schema['maximum'] = int(digits * '9') + 1
                     schema['minimum'] = -schema['maximum']
 
+    def get_field_name(self, field):
+        return field.field_name
+
     def get_paginator(self):
         pagination_class = getattr(self.view, 'pagination_class', None)
         if pagination_class: