diff --git a/pisi/operations/build.py b/pisi/operations/build.py
index 51c5f8af..d96d501c 100644
--- a/pisi/operations/build.py
+++ b/pisi/operations/build.py
@@ -684,7 +684,7 @@ class Builder:
                 if not ext:
                     break
             if not os.path.exists(src_dir):
-                src_dir = util.join_path(self.pkg_work_dir(), [d for d in os.walk(self.pkg_work_dir()).next()[1] if not d.startswith(".")][0])
+                src_dir = util.join_path(self.pkg_work_dir(), [d for d in next(os.walk(self.pkg_work_dir()))[1] if not d.startswith(".")][0])
                 if self.get_state() == "unpack":
                     ctx.ui.debug("Using %s as WorkDir" % src_dir)