diff --git a/doc/global/config.qdocconf b/doc/global/config.qdocconf
index 1ed2160522f..f07e7ea3539 100644
--- a/doc/global/config.qdocconf
+++ b/doc/global/config.qdocconf
@@ -7,9 +7,13 @@ dita.metadata.default.copyryear = 2024
 dita.metadata.default.copyrholder = The Qt Company Ltd
 dita.metadata.default.audience = programmer
 
+# Define `productname` such that `\since` prepends version numbers with `Qt`.
+# Required from Qt 6.9 onwards.
+productname = Qt
+
 #Set the main Qt index.html
 navigation.homepage = index.html
-navigation.hometitle = "Qt $QT_VER"
+navigation.hometitle = "$productname $QT_VER"
 
 #Words to ignore for auto-linking
 ignorewords += \