diff --git a/rest_framework/renderers.py b/rest_framework/renderers.py
index 8824fa660..0874dc3af 100644
--- a/rest_framework/renderers.py
+++ b/rest_framework/renderers.py
@@ -18,6 +18,7 @@ from django.http.multipartparser import parse_header
 from django.template import engines, loader
 from django.urls import NoReverseMatch
 from django.utils.html import mark_safe
+from django.utils.safestring import SafeString
 
 from rest_framework import VERSION, exceptions, serializers, status
 from rest_framework.compat import (
@@ -1060,6 +1061,7 @@ class OpenAPIRenderer(BaseRenderer):
         class Dumper(yaml.Dumper):
             def ignore_aliases(self, data):
                 return True
+        Dumper.add_representer(SafeString, Dumper.represent_str)
         return yaml.dump(data, default_flow_style=False, sort_keys=False, Dumper=Dumper).encode('utf-8')