diff --git a/src/dvd.py b/src/dvd.py
index 4f6cbd3..e7df379 100644
--- a/src/dvd.py
+++ b/src/dvd.py
@@ -51,7 +51,7 @@ class Copier:
             title = lsdvd["provider_id"]
             if title == "$PACKAGE_STRING":
                 title = "DVD"
-        now = time.strftime("%Y-%m-%dT%H:%M:%S")
+        now = time.strftime("%Y-%m-%dT%H_%M_%S")
         title = "%s %s" % (title, now)
 
         # Go through all the tracks, looking for the largest referenced sector.