diff --git a/src/xwayland.cpp b/src/xwayland.cpp
index 519615c..099c488 100644
--- a/src/xwayland.cpp
+++ b/src/xwayland.cpp
@@ -21,6 +21,7 @@
 #include <QTemporaryFile>
 #include <random>
 #include <sys/stat.h>
+#include <unistd.h>
 #include <X11/Xauth.h>
 
 int main(int argc, char *argv[])
diff --git a/waylib/examples/tinywl/helper.cpp b/waylib/examples/tinywl/helper.cpp
index b9d52b0..439a7cc 100644
--- a/waylib/examples/tinywl/helper.cpp
+++ b/waylib/examples/tinywl/helper.cpp
@@ -62,6 +62,7 @@
 #include <qwextdatacontrolv1.h>
 #include <qwviewporter.h>
 #include <qwalphamodifierv1.h>
+#include <unistd.h>
 
 #include <QGuiApplication>
 #include <QQmlApplicationEngine>
diff --git a/waylib/src/server/kernel/wserver.cpp b/waylib/src/server/kernel/wserver.cpp
index 0fa3eb8..00f7799 100644
--- a/waylib/src/server/kernel/wserver.cpp
+++ b/waylib/src/server/kernel/wserver.cpp
@@ -34,6 +34,7 @@
 #include <qpa/qplatformthemefactory_p.h>
 #include <qpa/qplatformintegrationfactory_p.h>
 #include <qpa/qplatformtheme.h>
+#include <unistd.h>
 
 QW_USE_NAMESPACE
 WAYLIB_SERVER_BEGIN_NAMESPACE
diff --git a/waylib/src/server/kernel/wsocket.cpp b/waylib/src/server/kernel/wsocket.cpp
index 9afec0c..dda63f5 100644
--- a/waylib/src/server/kernel/wsocket.cpp
+++ b/waylib/src/server/kernel/wsocket.cpp
@@ -15,9 +15,11 @@
 #include <sys/stat.h>
 #include <sys/file.h>
 #include <sys/socket.h>
+#include <sys/syscall.h>
 #include <sys/types.h>
 #include <sys/un.h>
 #include <signal.h>
+#include <unistd.h>
 #include <errno.h>
 
 struct wl_event_source;
diff --git a/waylib/src/server/protocols/wxwaylandsurface.cpp b/waylib/src/server/protocols/wxwaylandsurface.cpp
index b0e5684..f8af266 100644
--- a/waylib/src/server/protocols/wxwaylandsurface.cpp
+++ b/waylib/src/server/protocols/wxwaylandsurface.cpp
@@ -7,6 +7,8 @@
 #include "wxwayland.h"
 #include "private/wtoplevelsurface_p.h"
 
+#include <unistd.h>
+#include <sys/syscall.h>
 #include <qwxwaylandsurface.h>
 #include <qwcompositor.h>