diff --git a/changelog.d/8443.misc b/changelog.d/8443.misc
new file mode 100644
index 0000000000000000000000000000000000000000..633598e6b3027ebe316f359a2c7548071fcb747c
--- /dev/null
+++ b/changelog.d/8443.misc
@@ -0,0 +1 @@
+Configure `public_baseurl` when using demo scripts.
diff --git a/demo/start.sh b/demo/start.sh
index 83396e5c336fb956305ed6d4c6ca1d8004d67c0f..f6b5ea137f843add8f0b47f48f9b3c3d54d00967 100755
--- a/demo/start.sh
+++ b/demo/start.sh
@@ -30,6 +30,8 @@ for port in 8080 8081 8082; do
     if ! grep -F "Customisation made by demo/start.sh" -q  $DIR/etc/$port.config; then
         printf '\n\n# Customisation made by demo/start.sh\n' >> $DIR/etc/$port.config
 
+        echo "public_baseurl: http://localhost:$port/" >> $DIR/etc/$port.config
+
         echo 'enable_registration: true' >> $DIR/etc/$port.config
 
         # Warning, this heredoc depends on the interaction of tabs and spaces. Please don't