diff --git a/builder b/builder
index 3ba6706..150a33d 100755
--- a/builder
+++ b/builder
@@ -56,8 +56,8 @@ make DESTDIR=$build_dir/$deb_package $install_param
 
 cd $my_dir
 
-$build_dir/$deb_package/$prefix/bin/python${version:0:3} -m pip install --prefix /$prefix --root $build_dir/$deb_package --upgrade pip
-$build_dir/$deb_package/$prefix/bin/python${version:0:3} -m pip install --prefix /$prefix --root $build_dir/$deb_package six toml
+$build_dir/$deb_package/$prefix/bin/python3 -m pip install --prefix /$prefix --root $build_dir/$deb_package --upgrade pip
+$build_dir/$deb_package/$prefix/bin/python3 -m pip install --prefix /$prefix --root $build_dir/$deb_package six toml
 
 cd $build_dir