diff --git a/Userland/Libraries/LibJS/Forward.h b/Userland/Libraries/LibJS/Forward.h
index 236c2c03e1..2116c0a5f5 100644
--- a/Userland/Libraries/LibJS/Forward.h
+++ b/Userland/Libraries/LibJS/Forward.h
@@ -145,6 +145,7 @@ class Completion;
 class Console;
 class DeclarativeEnvironment;
 class DeferGC;
+class ECMAScriptFunctionObject;
 class Environment;
 class Error;
 class ErrorType;