diff --git a/paderbox/utils/pretty.py b/paderbox/utils/pretty.py
index 49dfe420..b0a2cc58 100644
--- a/paderbox/utils/pretty.py
+++ b/paderbox/utils/pretty.py
@@ -1,3 +1,4 @@
+import dataclasses
 import sys
 import io
 import IPython.lib.pretty