diff --git a/libkworkspace/CMakeLists.txt b/libkworkspace/CMakeLists.txt
--- a/libkworkspace/CMakeLists.txt
+++ b/libkworkspace/CMakeLists.txt
@@ -78,6 +78,7 @@
 install( FILES kdisplaymanager.h
                kworkspace.h
                sessionmanagement.h
+               sessionmanagementbackend.h
                ${CMAKE_CURRENT_BINARY_DIR}/config-libkworkspace.h
                ${CMAKE_CURRENT_BINARY_DIR}/kworkspace_export.h
          DESTINATION ${KDE_INSTALL_INCLUDEDIR}/kworkspace5 COMPONENT Devel )