diff --git a/python/pyotp/pyotp.SlackBuild b/python/pyotp/pyotp.SlackBuild
index d7779e30ad..30f13eee70 100644
--- a/python/pyotp/pyotp.SlackBuild
+++ b/python/pyotp/pyotp.SlackBuild
@@ -2,7 +2,7 @@
 
 # Slackware build script for pyotp
 
-# Copyright 2018 Dominik Drobek <dominik.drobek (at) o2.pl>
+# Copyright 2018, 2019 Dominik Drobek <dominik.drobek (at) o2.pl>
 # All rights reserved.
 #
 # Redistribution and use of this script, with or without modification, is
@@ -24,7 +24,7 @@
 
 PRGNAM=pyotp
 VERSION=${VERSION:-2.2.7}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
@@ -71,6 +71,10 @@ find -L . \
 
 python setup.py install --root=$PKG
 
+if $(python3 -c 'import sys' 2>/dev/null); then
+    python3 setup.py install --root=$PKG
+fi
+
 mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
 cp -a Changes.rst LICENSE README.rst $PKG/usr/doc/$PRGNAM-$VERSION
 cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild