diff --git a/mlair/run_modules/post_processing.py b/mlair/run_modules/post_processing.py
index 7a338b2f9febc18874cd4dbe1b09f1d84ac7750a..8f6bf05d29b2534e4918d72aa59f91aace0ec982 100644
--- a/mlair/run_modules/post_processing.py
+++ b/mlair/run_modules/post_processing.py
@@ -111,7 +111,7 @@ class PostProcessing(RunEnvironment):
 
         # sample uncertainty
         if self.data_store.get("do_uncertainty_estimate", "postprocessing"):
-            self.estimate_sample_uncertainty(True)
+            self.estimate_sample_uncertainty(separate_ahead=True)
 
         # feature importance bootstraps
         if self.data_store.get("evaluate_feature_importance", "postprocessing"):