diff --git a/marve/Measurements.py b/marve/Measurements.py
index d81bd49..482eefb 100644
--- a/marve/Measurements.py
+++ b/marve/Measurements.py
@@ -28,7 +28,7 @@
 from collections import OrderedDict
 import logging
 # custom
-from classes import Stats, Annotations
+from .classes import Stats, Annotations
 from grobid_quantities.quantities import QuantitiesClient