diff --git a/python/python3-WTForms/python3-WTForms.SlackBuild b/python/python3-WTForms/python3-WTForms.SlackBuild
index 9b450c890c..f9f03a21b9 100644
--- a/python/python3-WTForms/python3-WTForms.SlackBuild
+++ b/python/python3-WTForms/python3-WTForms.SlackBuild
@@ -65,6 +65,9 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \+
 
+PYVER=$(python3 -c 'import sys; print("%d.%d" % sys.version_info[:2])')
+export PYTHONPATH=/opt/python$PYVER/site-packages
+
 python3 -m build --no-isolation
 python3 -m installer -d "$PKG" dist/*.whl