diff --git a/Userland/Libraries/LibJS/Forward.h b/Userland/Libraries/LibJS/Forward.h
index 78bc0ce054..6e656ccfc4 100644
--- a/Userland/Libraries/LibJS/Forward.h
+++ b/Userland/Libraries/LibJS/Forward.h
@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <AK/Concepts.h>
 #include <AK/Types.h>
 
 #define JS_DECLARE_NATIVE_FUNCTION(name) \
@@ -282,6 +283,7 @@ struct PartialDurationRecord;
 };
 
 template<typename T>
+requires(!IsLvalueReference<T>)
 class ThrowCompletionOr;
 
 template<class T>
diff --git a/Userland/Libraries/LibJS/Runtime/Completion.h b/Userland/Libraries/LibJS/Runtime/Completion.h
index d1f226e647..0e36f3b8a0 100644
--- a/Userland/Libraries/LibJS/Runtime/Completion.h
+++ b/Userland/Libraries/LibJS/Runtime/Completion.h
@@ -246,6 +246,7 @@ private:
 namespace JS {
 
 template<typename ValueType>
+requires(!IsLvalueReference<ValueType>)
 class [[nodiscard]] ThrowCompletionOr {
 public:
     ThrowCompletionOr()