diff --git a/polyphonic/interface/templatetags/path_filters.py b/polyphonic/interface/templatetags/path_filters.py
index 4856509..52502d9 100644
--- a/polyphonic/interface/templatetags/path_filters.py
+++ b/polyphonic/interface/templatetags/path_filters.py
@@ -5,7 +5,7 @@ register = template.Library()
 
 
 def basename(value):
-    return os.path.basename(value)
+    return os.path.basename(str(value))
 
 
 register.filter("basename", basename)