diff --git a/src/plopp/widgets/clip3d.py b/src/plopp/widgets/clip3d.py
index 52edab25..cb414ab3 100644
--- a/src/plopp/widgets/clip3d.py
+++ b/src/plopp/widgets/clip3d.py
@@ -8,7 +8,6 @@
 
 import ipywidgets as ipw
 import numpy as np
-import pythreejs as p3
 import scipp as sc
 
 from ..core import Node
@@ -80,6 +79,8 @@ def __init__(
         width = (self._limits[w_axis][1] - self._limits[w_axis][0]).value
         height = (self._limits[h_axis][1] - self._limits[h_axis][0]).value
 
+        import pythreejs as p3
+
         self.outlines = [
             p3.LineSegments(
                 geometry=p3.EdgesGeometry(