diff --git a/src/main.cpp b/src/main.cpp
index bb29025d9c..8826b3f0ef 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -46,14 +46,10 @@
 #include <QTranslator>
 #include <QLibraryInfo>
 
-// system
-#if __has_include(<unistd.h>)
-#include <unistd.h>
-#endif
-
 #ifdef __has_include(<malloc.h>)
 #include <malloc.h>
 #endif
+#include <unistd.h>
 
 // xcb
 #include <xcb/damage.h>
diff --git a/src/main_x11.cpp b/src/main_x11.cpp
index 5cc4734a59..56531bcda6 100644
--- a/src/main_x11.cpp
+++ b/src/main_x11.cpp
@@ -42,10 +42,8 @@
 #include <QtDBus>
 
 // system
-#if __has_include(<unistd.h>)
-#include <unistd.h>
-#endif
 #include <iostream>
+#include <unistd.h>
 
 Q_LOGGING_CATEGORY(KWIN_CORE, "kwin_core", QtWarningMsg)
 
diff --git a/src/xwl/xwayland.cpp b/src/xwl/xwayland.cpp
index 10e1e68249..07656d414d 100644
--- a/src/xwl/xwayland.cpp
+++ b/src/xwl/xwayland.cpp
@@ -42,14 +42,10 @@
 #include <QTimer>
 #include <QtConcurrentRun>
 
-// system
-#if __has_include(<unistd.h>)
-#include <unistd.h>
-#endif
-
-#include <sys/socket.h>
 #include <cerrno>
 #include <cstring>
+#include <sys/socket.h>
+#include <unistd.h>
 
 namespace KWin
 {