diff --git a/mkdocs_literate_nav/plugin.py b/mkdocs_literate_nav/plugin.py
index 0423b42..3581d5e 100644
--- a/mkdocs_literate_nav/plugin.py
+++ b/mkdocs_literate_nav/plugin.py
@@ -83,9 +83,15 @@ def get_nav_for_dir(path: str) -> tuple[str, str] | None:
             # https://github.com/mkdocs/mkdocs/blob/ff0b726056/mkdocs/structure/nav.py#L113
             Page(None, file, {})  # type: ignore[arg-type]
 
-        # https://github.com/mkdocs/mkdocs/blob/fa5aa4a26e/mkdocs/structure/pages.py#L120
-        with open(file.abs_src_path, encoding="utf-8-sig") as f:
-            return nav_file_name, f.read()
+        try:  # MkDocs 1.6+
+            content = file.content_string
+        except AttributeError:
+            # https://github.com/mkdocs/mkdocs/blob/fa5aa4a26e/mkdocs/structure/pages.py#L120
+            assert file.abs_src_path is not None
+            with open(file.abs_src_path, encoding="utf-8-sig") as f:
+                content = f.read()
+
+        return nav_file_name, content
 
     globber = MkDocsGlobber(files)
     nav_parser = parser.NavParser(