diff --git a/normalisename.py b/normalisename.py
index d8720e7..ffc884f 100755
--- a/normalisename.py
+++ b/normalisename.py
@@ -29,16 +29,16 @@ class Normalisename:
     def whitelist(self):
         return self._whitelist.union({self.separator})
 
-    def __call__(self, files):
-        for path in files:
-            if not self.check_normal(path):
-                directory = dirname(path)
-                filename = basename(path)
-                normalpath = joinpath(directory, self.normalname(filename))
+    def __call__(self, paths):
+        for path in paths:
+            directory = dirname(path)
+            filename = basename(path)
+            normalpath = joinpath(directory, self.normalname(filename))
+            if path != normalpath:
                 self.operation(path, normalpath)  # pylint: disable=not-callable
 
-    def check_normal(self, filename):
-        filename = basename(filename)
+    def check_normal(self, path):
+        filename = basename(path)
         return filename == self.normalname(filename)
 
     def normalname(self, filename):