diff --git a/src/calibre/headless/headless_integration.cpp b/src/calibre/headless/headless_integration.cpp
index ac874cdf70..ce5f07226c 100644
--- a/src/calibre/headless/headless_integration.cpp
+++ b/src/calibre/headless/headless_integration.cpp
@@ -37,6 +37,8 @@ class GenericUnixServices : public QGenericUnixServices {
      * does not make sense anyway.
      */
     QByteArray desktopEnvironment() const { return QByteArrayLiteral("UNKNOWN"); }
+	bool openUrl(const QUrl &url) { Q_UNUSED(url); return false; }
+	bool openDocument(const QUrl &url) { Q_UNUSED(url); return false; }
 };
 #endif