diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 8e6a87a0b..2c9b66927 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -24,6 +24,8 @@ if (PAM_FOUND)
     define_pam_service(kscreensaver)
 endif (PAM_FOUND)
 
+set(KWIN_BIN "kwin_x11" CACHE STRING "Name of the KWin binary")
+
 find_program(some_x_program NAMES iceauth xrdb xterm)
 if (NOT some_x_program)
     set(some_x_program /usr/bin/xrdb)
diff --git a/ksmserver/config-ksmserver.h.cmake b/ksmserver/config-ksmserver.h.cmake
index 939632c86..a454a4d0b 100644
--- a/ksmserver/config-ksmserver.h.cmake
+++ b/ksmserver/config-ksmserver.h.cmake
@@ -10,3 +10,5 @@
 #endif
 
 #define KSCREENLOCKER_GREET_BIN "${CMAKE_INSTALL_PREFIX}/${LIBEXEC_INSTALL_DIR}/kscreenlocker_greet"
+
+#define KWIN_BIN "${KWIN_BIN}"
\ No newline at end of file
diff --git a/ksmserver/server.cpp b/ksmserver/server.cpp
index 644013b33..dc2a3e5c7 100644
--- a/ksmserver/server.cpp
+++ b/ksmserver/server.cpp
@@ -1002,8 +1002,8 @@ bool KSMServer::defaultSession() const
 // - if that fails, just use KWin
 void KSMServer::selectWm( const QString& kdewm )
 {
-    wm = QStringLiteral( "kwin" ); // defaults
-    wmCommands = ( QStringList() << QStringLiteral( "kwin" ) );
+    wm = QStringLiteral( KWIN_BIN ); // defaults
+    wmCommands = ( QStringList() << QStringLiteral( KWIN_BIN ) );
     if( qstrcmp( getenv( "KDE_FAILSAFE" ), "1" ) == 0 )
         return; // failsafe, force kwin
     if( !kdewm.isEmpty())
diff --git a/ksmserver/startup.cpp b/ksmserver/startup.cpp
index 7fa10376c..c19483089 100644
--- a/ksmserver/startup.cpp
+++ b/ksmserver/startup.cpp
@@ -34,6 +34,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <krun.h>
 #include <config-workspace.h>
 #include <config-unix.h> // HAVE_LIMITS_H
+#include <config-ksmserver.h>
 
 #include <pwd.h>
 #include <sys/types.h>
@@ -200,11 +201,11 @@ void KSMServer::wmProcessChange()
     if( wmProcess->state() == QProcess::NotRunning )
     { // wm failed to launch for some reason, go with kwin instead
         kWarning( 1218 ) << "Window manager" << wm << "failed to launch";
-        if( wm == QStringLiteral( "kwin" ) )
+        if( wm == QStringLiteral( KWIN_BIN ) )
             return; // uhoh, kwin itself failed
         kDebug( 1218 ) << "Launching KWin";
-        wm = QStringLiteral( "kwin" );
-        wmCommands = ( QStringList() << QStringLiteral( "kwin" ) );
+        wm = QStringLiteral( KWIN_BIN );
+        wmCommands = ( QStringList() << QStringLiteral( KWIN_BIN ) );
         // launch it
         launchWM( QList< QStringList >() << wmCommands );
         return;