diff --git a/python-tox.spec b/python-tox.spec
index a5d8c11..ae4674e 100644
--- a/python-tox.spec
+++ b/python-tox.spec
@@ -17,7 +17,7 @@
 
 
 %{?sle15_python_module_pythons}
-%if 0%{?sle15_python_module_pythons}
+%if %{defined sle15_python_module_pythons}
 %bcond_without devpi_process
 %else
 %bcond_with devpi_process