diff --git a/test/ModuleInterface/Observable.swift b/test/ModuleInterface/Observable.swift
index 77dbcfc3130e6..7bcad03394c64 100644
--- a/test/ModuleInterface/Observable.swift
+++ b/test/ModuleInterface/Observable.swift
@@ -4,6 +4,7 @@
 // RUN: %FileCheck %s < %t/Library.swiftinterface
 
 // REQUIRES: swift_swift_parser
+// REQUIRES: observation
 
 import _Observation