diff --git a/Filter.py b/Filter.py
index a728115..87b4009 100644
--- a/Filter.py
+++ b/Filter.py
@@ -111,8 +111,9 @@ def printDescriptions(reason):
 
 
 def _diag_sortkey(x):
-    xs = x.split()
-    return (xs[2], xs[1])
+    xs = x.split(maxsplit=2)
+    # ['game.x86_64:', 'W:', 'call-to-mktemp /usr/games/lib/blub\n']
+    return (xs[2], xs[1], xs[0])
 
 
 def printAllReasons():