diff --git a/mkdocstrings_handlers/crystal/renderer.py b/mkdocstrings_handlers/crystal/renderer.py
index 43d6a4f..30068ce 100644
--- a/mkdocstrings_handlers/crystal/renderer.py
+++ b/mkdocstrings_handlers/crystal/renderer.py
@@ -40,8 +40,8 @@ def render(self, data: DocItem, config: Mapping[str, Any]) -> str:
                 root=True,
             )
 
-    def get_anchor(self, data: DocItem) -> str:
-        return data.abs_id
+    def get_anchors(self, data: DocItem) -> tuple[str, ...]:
+        return (data.abs_id,)
 
     def update_env(self, md: Markdown, config: dict) -> None:
         super().update_env(md, config)