diff --git a/src/plugins/platforms/xcb/qxcbintegration.cpp b/src/plugins/platforms/xcb/qxcbintegration.cpp
index e10c556473..cef81ddfec 100644
--- a/src/plugins/platforms/xcb/qxcbintegration.cpp
+++ b/src/plugins/platforms/xcb/qxcbintegration.cpp
@@ -443,7 +443,7 @@ QByteArray QXcbIntegration::wmClass() const
     return m_wmClass;
 }
 
-#ifndef QT_NO_SESSIONMANAGER
+#if !defined(QT_NO_SESSIONMANAGER) && defined(XCB_USE_SM)
 QPlatformSessionManager *QXcbIntegration::createPlatformSessionManager(const QString &id, const QString &key) const
 {
     return new QXcbSessionManager(id, key);
diff --git a/src/plugins/platforms/xcb/qxcbintegration.h b/src/plugins/platforms/xcb/qxcbintegration.h
index 7fd5756fd5..7ca7befc64 100644
--- a/src/plugins/platforms/xcb/qxcbintegration.h
+++ b/src/plugins/platforms/xcb/qxcbintegration.h
@@ -101,7 +101,7 @@ public:
 
     QByteArray wmClass() const;
 
-#ifndef QT_NO_SESSIONMANAGER
+#if !defined(QT_NO_SESSIONMANAGER) && defined(XCB_USE_SM)
     QPlatformSessionManager *createPlatformSessionManager(const QString &id, const QString &key) const Q_DECL_OVERRIDE;
 #endif
 
diff --git a/src/plugins/platforms/xcb/xcb-plugin.pro b/src/plugins/platforms/xcb/xcb-plugin.pro
index 341c33e8e6..4f69ca8aab 100644
--- a/src/plugins/platforms/xcb/xcb-plugin.pro
+++ b/src/plugins/platforms/xcb/xcb-plugin.pro
@@ -74,6 +74,7 @@ contains(QT_CONFIG, xcb-render) {
 
 # build with session management support
 contains(QT_CONFIG, xcb-sm) {
+    DEFINES += XCB_USE_SM
     LIBS += -lSM -lICE
     SOURCES += qxcbsessionmanager.cpp
     HEADERS += qxcbsessionmanager.h