diff --git a/Userland/Applications/Assistant/main.cpp b/Userland/Applications/Assistant/main.cpp
index 743dc75188..24f16aef43 100644
--- a/Userland/Applications/Assistant/main.cpp
+++ b/Userland/Applications/Assistant/main.cpp
@@ -17,6 +17,7 @@
 #include <LibGUI/TextBox.h>
 #include <LibGfx/Palette.h>
 #include <LibThreading/Lock.h>
+#include <unistd.h>
 
 namespace Assistant {