diff --git a/plugins/idletime/CMakeLists.txt b/plugins/idletime/CMakeLists.txt
--- a/plugins/idletime/CMakeLists.txt
+++ b/plugins/idletime/CMakeLists.txt
@@ -3,6 +3,7 @@
 )
 
 add_library(KF5IdleTimeKWinWaylandPrivatePlugin MODULE ${idletime_plugin_SRCS})
+set_target_properties(KF5IdleTimeKWinWaylandPrivatePlugin PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin/kf5/org.kde.kidletime.platforms/")
 target_link_libraries(KF5IdleTimeKWinWaylandPrivatePlugin
     kwin
     KF5::IdleTime