diff --git a/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp b/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp
index 33f868a609a..c68e38b1c87 100644
--- a/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp
+++ b/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp
@@ -63,6 +63,7 @@ QbsProjectManagerPlugin::QbsProjectManagerPlugin() :
 
 bool QbsProjectManagerPlugin::initialize(const QStringList &arguments, QString *errorMessage)
 {
+    Q_UNUSED(errorMessage);
     m_manager = new QbsManager(this);
     m_projectExplorer = ProjectExplorer::ProjectExplorerPlugin::instance();
     const Core::Context projectContext(::QbsProjectManager::Constants::PROJECT_ID);