diff --git a/helpers/xclipboardsync/waylandclipboard.cpp b/helpers/xclipboardsync/waylandclipboard.cpp
--- a/helpers/xclipboardsync/waylandclipboard.cpp
+++ b/helpers/xclipboardsync/waylandclipboard.cpp
@@ -35,6 +35,7 @@
 #include <QMimeType>
 #include <qplatformdefs.h>
 
+#include <errno.h>
 #include <unistd.h>
 
 using namespace KWayland::Client;