diff --git a/zerver/lib/markdown/__init__.py b/zerver/lib/markdown/__init__.py
index 506d80cf53..d51af110b4 100644
--- a/zerver/lib/markdown/__init__.py
+++ b/zerver/lib/markdown/__init__.py
@@ -2282,15 +2282,15 @@ class ZulipMarkdown(markdown.Markdown):
         reg.register(UnicodeEmoji(UNICODE_EMOJI_RE), "unicodeemoji", 0)
         return reg
 
-    def register_linkifiers(self, inlinePatterns: markdown.util.Registry) -> markdown.util.Registry:
+    def register_linkifiers(self, registry: markdown.util.Registry) -> markdown.util.Registry:
         for linkifier in self.linkifiers:
             pattern = linkifier["pattern"]
-            inlinePatterns.register(
+            registry.register(
                 LinkifierPattern(pattern, linkifier["url_format"], self),
                 f"linkifiers/{pattern}",
                 45,
             )
-        return inlinePatterns
+        return registry
 
     def build_treeprocessors(self) -> markdown.util.Registry:
         # Here we build all the processors from upstream, plus a few of our own.
diff --git a/zerver/openapi/markdown_extension.py b/zerver/openapi/markdown_extension.py
index bcf3d96a1f..3cbdfb6ea1 100644
--- a/zerver/openapi/markdown_extension.py
+++ b/zerver/openapi/markdown_extension.py
@@ -437,11 +437,11 @@ class APIMarkdownExtension(Extension):
 
 class BasePreprocessor(Preprocessor):
     def __init__(
-        self, REGEXP: Pattern[str], md: markdown.Markdown, config: Mapping[str, Any]
+        self, regexp: Pattern[str], md: markdown.Markdown, config: Mapping[str, Any]
     ) -> None:
         super().__init__(md)
         self.api_url = config["api_url"]
-        self.REGEXP = REGEXP
+        self.REGEXP = regexp
 
     def run(self, lines: List[str]) -> List[str]:
         done = False