diff --git a/metadata/de.baumann.pdfcreator.yml b/metadata/de.baumann.pdfcreator.yml
index 1a5f653aa9..6a0016cf9e 100644
--- a/metadata/de.baumann.pdfcreator.yml
+++ b/metadata/de.baumann.pdfcreator.yml
@@ -188,4 +188,4 @@ UpdateCheckMode: None
 CurrentVersion: '3.8'
 CurrentVersionCode: 25
 
-NoSourceSince: 3.8
+NoSourceSince: '3.8'