diff --git a/seafile/CHANGELOG.md b/seafile/CHANGELOG.md
index ed83def92..7b21add42 100644
--- a/seafile/CHANGELOG.md
+++ b/seafile/CHANGELOG.md
@@ -1,4 +1,7 @@
 
+## 12.0.18-2 (2026-02-22)
+- Fix download URLs containing incorrect `/seafhttp` prefix on first run by re-applying URL configuration after upstream init scripts complete.
+
 ## 12.0.18 (2026-03-20)
 - Fix `env_vars` handling so extra environment variables are exported correctly.
 
diff --git a/seafile/config.yaml b/seafile/config.yaml
index 87bd0b172..4cca056bb 100644
--- a/seafile/config.yaml
+++ b/seafile/config.yaml
@@ -128,5 +128,5 @@ services:
 slug: seafile
 udev: true
 url: https://github.com/alexbelgium/hassio-addons/tree/master/seafile
-version: "12.0.18"
+version: "12.0.18-2"
 webui: http://[HOST]:[PORT:8000]
diff --git a/seafile/rootfs/etc/cont-init.d/99-run.sh b/seafile/rootfs/etc/cont-init.d/99-run.sh
index c7985af08..d0e08cc72 100755
--- a/seafile/rootfs/etc/cont-init.d/99-run.sh
+++ b/seafile/rootfs/etc/cont-init.d/99-run.sh
@@ -155,6 +155,27 @@ done
 bashio::log.info "SERVICE_URL set to ${SERVICE_URL_VALUE}"
 bashio::log.info "FILE_SERVER_ROOT set to ${FILE_SERVER_ROOT_VALUE}"
 
+# The upstream write_config.sh hardcodes /seafhttp in FILE_SERVER_ROOT and
+# overwrites our settings on first run.  Create a helper that re-applies the
+# addon's URL configuration right before Seafile services start, so it always
+# takes effect regardless of what the upstream init/setup scripts wrote.
+cat > /home/seafile/apply_addon_urls.sh << URLEOF
+#!/bin/bash
+for _CONF in "${DATA_LOCATION}/conf/seahub_settings.py" "${DATA_LOCATION}/seafile/conf/seahub_settings.py"; do
+    if [ -f "\$_CONF" ]; then
+        sed -i '/^SERVICE_URL *=/d' "\$_CONF"
+        sed -i '/^FILE_SERVER_ROOT *=/d' "\$_CONF"
+        echo 'SERVICE_URL = "${SERVICE_URL_VALUE}"' >> "\$_CONF"
+        echo 'FILE_SERVER_ROOT = "${FILE_SERVER_ROOT_VALUE}"' >> "\$_CONF"
+    fi
+done
+URLEOF
+chmod +x /home/seafile/apply_addon_urls.sh
+sed -i '/print "Launching seafile"/i /home/seafile/apply_addon_urls.sh' /home/seafile/launch.sh
+if ! grep -q 'apply_addon_urls.sh' /home/seafile/launch.sh 2>/dev/null; then
+    bashio::log.warning "Could not inject URL configuration into launch.sh; URLs may use upstream defaults"
+fi
+
 ###################
 # Define database #
 ###################