diff --git a/km3io/jpp.py b/km3io/jpp.py
index 88c7e771b9cdc983d4337a89f9b26fc7221a910a..fdf11655f444e6162f136914706d7da17a4aa54e 100644
--- a/km3io/jpp.py
+++ b/km3io/jpp.py
@@ -79,7 +79,7 @@ class SummmarySlices:
     def headers(self):
         if self._headers is None:
             self._headers = self._read_headers()
-        return self._slices
+        return self._headers
 
     @property
     def slices(self):