diff --git a/pes_to_spec/test/offline_analysis.py b/pes_to_spec/test/offline_analysis.py
index 1ea015c422eb91d42338684bd18e173e4ed7f933..6cb2a52bdadb5b9f883b8012a662c4edce03015a 100755
--- a/pes_to_spec/test/offline_analysis.py
+++ b/pes_to_spec/test/offline_analysis.py
@@ -13,6 +13,7 @@ from pes_to_spec.model import Model, matching_ids
 
 # for helper plots
 from pes_to_spec.model import SelectRelevantLowResolution
+from pes_to_spec.model import HighResolutionSmoother
 from sklearn.decomposition import PCA
 
 from itertools import product