diff --git a/Userland/Libraries/LibJS/JIT/Compiler.cpp b/Userland/Libraries/LibJS/JIT/Compiler.cpp
index ae6c4fb5d5..530288d82b 100644
--- a/Userland/Libraries/LibJS/JIT/Compiler.cpp
+++ b/Userland/Libraries/LibJS/JIT/Compiler.cpp
@@ -9,6 +9,7 @@
 #include <LibJS/JIT/Compiler.h>
 #include <LibJS/Runtime/ValueInlines.h>
 #include <sys/mman.h>
+#include <unistd.h>
 
 namespace JS::JIT {