diff --git a/Userland/Libraries/LibJS/Runtime/CanonicalIndex.h b/Userland/Libraries/LibJS/Runtime/CanonicalIndex.h
index 71f81d5155..e9a6eafa13 100644
--- a/Userland/Libraries/LibJS/Runtime/CanonicalIndex.h
+++ b/Userland/Libraries/LibJS/Runtime/CanonicalIndex.h
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include <AK/Types.h>
+
 class CanonicalIndex {
 public:
     enum class Type {