--- a/browser/installer/package-manifest.in
+++ b/browser/installer/package-manifest.in
@@ -348,17 +348,17 @@
 @RESPATH@/components/BrowserElementParent.manifest
 @RESPATH@/components/BrowserElementParent.js
 @RESPATH@/components/BrowserElementProxy.manifest
 @RESPATH@/components/BrowserElementProxy.js
 @RESPATH@/components/FeedProcessor.manifest
 @RESPATH@/components/FeedProcessor.js
 @RESPATH@/components/PackagedAppUtils.js
 @RESPATH@/components/PackagedAppUtils.manifest
-#if defined(XP_LINUX) || defined(XP_WIN)
+#ifndef XP_MACOSX
 ; OSX uses native platform impl.  Windows, Linux, and Android uses fallback JS impl.
 @BINPATH@/components/nsDNSServiceDiscovery.manifest
 @BINPATH@/components/nsDNSServiceDiscovery.js
 #endif
 @RESPATH@/browser/components/BrowserFeeds.manifest
 @RESPATH@/browser/components/FeedConverter.js
 @RESPATH@/browser/components/FeedWriter.js
 @RESPATH@/browser/components/WebContentConverter.js