diff --git a/mkdocs_literate_nav/parser.py b/mkdocs_literate_nav/parser.py
index b36bd79..c3280b4 100644
--- a/mkdocs_literate_nav/parser.py
+++ b/mkdocs_literate_nav/parser.py
@@ -150,7 +150,7 @@ def make_nav(
                 abs_link = out_item = posixpath.normpath(posixpath.join(roots[0], link).lstrip("/"))
                 if abs_link == ".":
                     abs_link = ""
-                if globber.isdir(abs_link):
+                if link.endswith("/") and globber.isdir(abs_link):
                     try:
                         out_item = get_nav_for_roots((abs_link, *roots))
                     except RecursionError as e:
diff --git a/tests/markdown_to_nav/nested/test_dir_without_slash.yml b/tests/markdown_to_nav/nested/test_dir_without_slash.yml
new file mode 100644
index 0000000..1933575
--- /dev/null
+++ b/tests/markdown_to_nav/nested/test_dir_without_slash.yml
@@ -0,0 +1,8 @@
+files:
+- foo/bar.md
+- foo/index.md
+navs:
+  /: |
+    * [Foo](foo)
+output:
+- Foo: foo