diff --git a/scripts/shear_and_extrude.py b/scripts/shear_and_extrude.py
index 2f98b01..85238d2 100644
--- a/scripts/shear_and_extrude.py
+++ b/scripts/shear_and_extrude.py
@@ -517,6 +517,7 @@ def shearAndExtrude(path):
     axesByTag = {axis.tag: axis for axis in doc.axes}
     depthAxisFields = getAxisFields(axesByTag["EDPT"])
     highlightAxisFields = getAxisFields(axesByTag["EHLT"])
+    defaultFont = None
 
     for depth, depthName in depthAxisFields:
         extrudedFont = deepcopy(font)
@@ -530,6 +531,7 @@ def shearAndExtrude(path):
             extrudedFont.lib[COLOR_PALETTES_KEY] = palettes
             extrudedFont.lib[COLOR_LAYERS_KEY] = colorGlyphs
             extrudedFont.features.text += manualFeatures
+            defaultFont = extrudedFont
 
         extrudedPath = path.parent / (path.stem + "-" + depthName + path.suffix)
         extrudedFont.save(extrudedPath, overwrite=True)
@@ -551,6 +553,10 @@ def shearAndExtrude(path):
                     if glyphName in layer:
                         del layer[glyphName]
 
+        for gn in defaultFont.keys():
+            if gn.startswith(".notdef"):
+                highlightFont[gn] = defaultFont[gn]
+
         highlightPath = path.parent / (path.stem + "-" + highlightName + path.suffix)
         highlightFont.save(highlightPath, overwrite=True)
         doc.addSourceDescriptor(