diff --git a/build-aux/snap/snapcraft.yaml b/build-aux/snap/snapcraft.yaml
index c8ad19fac..45e79f036 100644
--- a/build-aux/snap/snapcraft.yaml
+++ b/build-aux/snap/snapcraft.yaml
@@ -31,6 +31,7 @@ apps:
       QT_QPA_PLATFORMTHEME: gtk3
       QT_AUTO_SCREEN_SCALE_FACTOR: 1
       HOME: $SNAP_USER_COMMON
+      PYTHONPATH: $SNAP:$SNAP/lib/python3.6/site-packages:$SNAP/usr/lib/python3.6:$SNAP/usr/lib/python3.6/lib-dynload
 
   qet-tb-generator:
     command: bin/qelectrotech-launch $SNAP/bin/qet_tb_generator