diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
index 5f20ab2ab6..2f67c61146 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
@@ -1262,13 +1262,7 @@ ThrowCompletionOr<String> parse_temporal_calendar_string(GlobalObject& global_ob
         return "iso8601"sv;
     }
 
-    // 5. If ! IsBuiltinCalendar(id) is false, then
-    if (!is_builtin_calendar(*id_part)) {
-        // a. Throw a RangeError exception.
-        return vm.throw_completion<RangeError>(global_object, ErrorType::TemporalInvalidCalendarIdentifier, *id_part);
-    }
-
-    // 6. Return id.
+    // 5. Return id.
     return id_part.value();
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
index 6d61d702a6..0745f86a00 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
@@ -407,8 +407,12 @@ ThrowCompletionOr<Object*> to_temporal_calendar(GlobalObject& global_object, Val
 
     // 3. If ! IsBuiltinCalendar(identifier) is false, then
     if (!is_builtin_calendar(identifier)) {
-        // a. Let identifier be ? ParseTemporalCalendarString(identifier).
+        // a. Set identifier to ? ParseTemporalCalendarString(identifier).
         identifier = TRY(parse_temporal_calendar_string(global_object, identifier));
+
+        // b. If ! IsBuiltinCalendar(identifier) is false, throw a RangeError exception.
+        if (!is_builtin_calendar(identifier))
+            return vm.throw_completion<RangeError>(global_object, ErrorType::TemporalInvalidCalendarIdentifier, identifier);
     }
 
     // 4. Return ! CreateTemporalCalendar(identifier).