diff --git a/build.sh b/build.sh
index 4b27d63a..7248eedf 100755
--- a/build.sh
+++ b/build.sh
@@ -3,7 +3,7 @@
 # build the .deb and .appimage files
 # https://ubuntuforums.org/showthread.php?t=1002909
 
-python setup.py sdist
+python3 setup.py sdist
 cd dist
 tar -xzf key-mapper-0.1.0.tar.gz
 cd key-mapper-0.1.0