diff --git a/pisi/atomicoperations.py b/pisi/atomicoperations.py
index fcfaf335..ce1e23f9 100644
--- a/pisi/atomicoperations.py
+++ b/pisi/atomicoperations.py
@@ -80,7 +80,7 @@ class Install(AtomicOperation):
                 (version, release, build, distro, distro_release) = installdb.get_version_and_distro_release(pkg.name)
                 # pisi distro upgrade should not use delta support
                 if distro == pkg.distribution and distro_release == pkg.distributionRelease:
-                    delta = pkg.get_delta(buildFrom=build)
+                    delta = pkg.get_delta(release)
 
             ignore_delta = ctx.config.values.general.ignore_delta
 
diff --git a/pisi/operations/helper.py b/pisi/operations/helper.py
index f5366a5a..799da7f4 100644
--- a/pisi/operations/helper.py
+++ b/pisi/operations/helper.py
@@ -93,7 +93,7 @@ def calculate_download_sizes(order):
             (version, release, build, distro, distro_release) = installdb.get_version_and_distro_release(pkg.name)
             # pisi distro upgrade should not use delta support
             if distro == pkg.distribution and distro_release == pkg.distributionRelease:
-                delta = pkg.get_delta(buildFrom=build)
+                delta = pkg.get_delta(release)
 
         ignore_delta = ctx.config.values.general.ignore_delta