diff --git a/pisi/constants.py b/pisi/constants.py
index 02738f45..5ef870e4 100644
--- a/pisi/constants.py
+++ b/pisi/constants.py
@@ -47,7 +47,7 @@ class Constants:
         self.__c.package_suffix = ".pisi"
 
         # delta suffix for package names
-        self.__c.delta_package_suffix = ".pisi.delta"
+        self.__c.delta_package_suffix = ".delta.pisi"
 
         # suffix for lzma
         self.__c.lzma_suffix = ".lzma"