diff --git a/src/seismic_hazard_forecasting.py b/src/seismic_hazard_forecasting.py
index dd8cb7e..55a2807 100644
--- a/src/seismic_hazard_forecasting.py
+++ b/src/seismic_hazard_forecasting.py
@@ -511,6 +511,7 @@ verbose: {verbose}")
 
 
             import xml.etree.ElementTree as ET      # <-- TODO place this with other imports
+            import json
 
             # -----------------------------------------
             # Inject bounding box (BBOX) metadata into the SVG