diff --git a/src/client/plasmawindowmanagement.cpp b/src/client/plasmawindowmanagement.cpp
--- a/src/client/plasmawindowmanagement.cpp
+++ b/src/client/plasmawindowmanagement.cpp
@@ -31,6 +31,8 @@
 #include <QTimer>
 #include <qplatformdefs.h>
 
+#include <errno.h>
+
 namespace KWayland
 {
 namespace Client