diff --git a/pisi/operations/delta.py b/pisi/operations/delta.py
index c6dc98e4..268e8933 100644
--- a/pisi/operations/delta.py
+++ b/pisi/operations/delta.py
@@ -106,7 +106,10 @@ def find_delta(oldfiles, newfiles):
 
     files_new = set(map(lambda x:x.hash, newfiles.list))
     files_old = set(map(lambda x:x.hash, oldfiles.list))
-    files_delta = files_new - files_old
+    files_delta = list(files_new - files_old)
+
+    # Add to-be-replaced config files to delta package regardless of its state
+    files_delta.extend([f.hash for f in newfiles.list if f.type=='config' and f.replace])
 
     deltas = []
     for h in files_delta: