diff --git a/tools/companion-gen-icons.py b/tools/companion-gen-icons.py
index b34144306..f13632609 100755
--- a/tools/companion-gen-icons.py
+++ b/tools/companion-gen-icons.py
@@ -13,6 +13,7 @@ import shutil
 import subprocess
 import platform
 import tarfile
+import pathlib
 from PIL import Image
 
 # if False, then sips will be used instead of ImageMagick
@@ -169,6 +170,8 @@ elif platform.system == "Darwin":
     # Following was based on MIT licensed work from retifrav
     # https://github.com/retifrav/python-scripts/blob/master/generate-iconset/generate-iconset.py
 
+    ext = pathlib.Path(ABS_LOGO_FILENAME).suffix
+
     class IconParameters():
         width = 0
         scale = 1