diff --git a/CHANGES b/CHANGES
index 7bd1dfda5..51d0a6400 100644
--- a/CHANGES
+++ b/CHANGES
@@ -34,6 +34,7 @@ Bugs fixed
   :recursive: option
 * #8618: html: kbd role produces incorrect HTML when compound-key separators (-,
   + or ^) are used as keystrokes
+* #8629: html: A type warning for html_use_opensearch is shown twice
 * #8094: texinfo: image files on the different directory with document are not
   copied
 
diff --git a/sphinx/builders/html/__init__.py b/sphinx/builders/html/__init__.py
index 641d0eda2..ba78f2d7e 100644
--- a/sphinx/builders/html/__init__.py
+++ b/sphinx/builders/html/__init__.py
@@ -448,9 +448,6 @@ class StandaloneHTMLBuilder(Builder):
         logo = path.basename(self.config.html_logo) if self.config.html_logo else ''
         favicon = path.basename(self.config.html_favicon) if self.config.html_favicon else ''
 
-        if not isinstance(self.config.html_use_opensearch, str):
-            logger.warning(__('html_use_opensearch config value must now be a string'))
-
         self.relations = self.env.collect_relations()
 
         rellinks = []  # type: List[Tuple[str, str, str, str]]