diff --git a/CHANGELOG.md b/CHANGELOG.md
index dad16c6..442e287 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 All notable user-facing changes to QOpen are documented here.
 
+## [Unreleased]
+
+### Fixed
+
+- Recovered the plugin directory from the plugin's own entry point URL when
+  omarchy 4.0.4+ strips `__sourceDir` from third-party manifests, restoring the
+  catalog on shells that sanitize plugin manifests.
+
 ## [2.5.1] - 2026-08-28
 
 ### Security
diff --git a/QOpen.qml b/QOpen.qml
index 5854d1e..fb70fd8 100644
--- a/QOpen.qml
+++ b/QOpen.qml
@@ -12,9 +12,29 @@ Item {
   property string omarchyPath: Quickshell.env("OMARCHY_PATH")
   property var shell: null
   property var manifest: null
+  property var pluginRegistry: null
 
   readonly property string pluginId: (manifest && manifest.id) || "qopen.launcher"
-  readonly property string pluginDir: (manifest && manifest.__sourceDir) || ""
+  // omarchy >= 4.0.4 hands third-party plugins a sanitized manifest without
+  // __sourceDir. Recover the plugin directory from the own entry point URL
+  // (file:///.../qopen.launcher/QOpen.qml -> .../qopen.launcher) instead.
+  readonly property string pluginDir: {
+    if (manifest && manifest.__sourceDir) return String(manifest.__sourceDir)
+    var entryUrl = ""
+    if (pluginRegistry) {
+      try {
+        entryUrl = String(pluginRegistry.entryPointUrl(manifest, "menu") || "")
+      } catch (e) {
+        entryUrl = ""
+      }
+    }
+    if (!entryUrl) return ""
+    var path = entryUrl.replace(/^file:\/\//, "")
+    var slash = path.lastIndexOf("/")
+    if (slash < 0) return ""
+    try { return decodeURIComponent(path.slice(0, slash)) }
+    catch (e) { return path.slice(0, slash) }
+  }
   readonly property string backendPath: pluginDir ? pluginDir + "/bin/qopen" : ""
 
   onPluginDirChanged: {
diff --git a/tests/test_backend.py b/tests/test_backend.py
index 03b52bc..1ad0400 100644
--- a/tests/test_backend.py
+++ b/tests/test_backend.py
@@ -399,6 +399,14 @@ def test_catalog_waits_for_the_host_to_inject_the_plugin_directory(self) -> None
         self.assertIn("if (root.pluginDir) root.requestCatalogReload()", qopen_source)
         self.assertNotIn('readonly property string backendPath: pluginDir + "/bin/qopen"', qopen_source)
 
+    def test_plugin_directory_falls_back_to_entry_point_url_when_manifest_strips_source_dir(self) -> None:
+        qopen_source = (REPOSITORY / "QOpen.qml").read_text(encoding="utf-8")
+
+        self.assertIn('return String(manifest.__sourceDir)', qopen_source)
+        self.assertIn('pluginRegistry.entryPointUrl(manifest, "menu")', qopen_source)
+        self.assertIn('entryUrl.replace(/^file:\\/\\//, "")', qopen_source)
+        self.assertIn('decodeURIComponent(path.slice(0, slash))', qopen_source)
+
     def test_missing_catalog_requests_first_run_initialization(self) -> None:
         qopen_source = (REPOSITORY / "QOpen.qml").read_text(encoding="utf-8")