diff --git a/maintainers/scripts/kde/generate-sources.py b/maintainers/scripts/kde/generate-sources.py
index e107e00fb71d..e7c52368363a 100755
--- a/maintainers/scripts/kde/generate-sources.py
+++ b/maintainers/scripts/kde/generate-sources.py
@@ -23,7 +23,8 @@ mkKdeDerivation {
 '''.strip())
 
 ROOT_TEMPLATE = jinja2.Template('''
-{callPackage}: {
+{ callPackage }:
+{
   {%- for p in packages %}
   {{ p }} = callPackage ./{{ p }} { };
   {%- endfor %}