diff --git a/km3io/definitions/__init__.py b/km3io/definitions/__init__.py
index 3e6b3008eb176f44541b9a7281bca0b47097048e..125de05683aa6f1bfcfbffe6ce938b47f022658e 100644
--- a/km3io/definitions/__init__.py
+++ b/km3io/definitions/__init__.py
@@ -3,8 +3,9 @@
 from .mc_header import data as mc_header
 
 from .trigger import data as trigger
-from .trigger import data_r as trigger_idx
 from .fitparameters import data as fitparameters
-from .fitparameters import data_r as fitparameters_idx
 from .reconstruction import data as reconstruction
-from .reconstruction import data_r as reconstruction_idx
+
+trigger_idx = {v: k for k, v in trigger.items()}
+fitparameters_idx = {v: k for k, v in fitparameters.items()}
+reconstruction_idx = {v: k for k, v in reconstruction.items()}