diff --git a/normalisename.py b/normalisename.py
index 1e8cbb9..b055aa2 100644
--- a/normalisename.py
+++ b/normalisename.py
@@ -20,9 +20,8 @@ for path in argv[1:]:
                joinpath
                (
                    dir,
-                   ''.join(ch for ch in file
+                   ''.join(ch for ch in file.replace(' ', '_')
                            if ch.isalnum()
                            or ch in whitelist)
                )
-           )
-           .replace(' ', '_'))
+           ))