diff --git a/src/WallpaperEngine/Render/Drivers/Output/CWaylandOutputViewport.cpp b/src/WallpaperEngine/Render/Drivers/Output/CWaylandOutputViewport.cpp
index 54a7e6f..2fee400 100644
--- a/src/WallpaperEngine/Render/Drivers/Output/CWaylandOutputViewport.cpp
+++ b/src/WallpaperEngine/Render/Drivers/Output/CWaylandOutputViewport.cpp
@@ -13,6 +13,8 @@ extern "C" {
 #undef namespace
 #undef static
 
+#include <unistd.h>
+
 using namespace WallpaperEngine::Render::Drivers;
 using namespace WallpaperEngine::Render::Drivers::Output;