--- a/browser/build.mk
+++ b/browser/build.mk
@@ -44,17 +44,24 @@ TIERS += app
 ifdef MOZ_EXTENSIONS
 tier_app_dirs += extensions
 endif
 
 tier_app_dirs += $(MOZ_BRANDING_DIRECTORY)
 
 tier_app_dirs += toolkit/components/console/hudservice
 
+ifdef MOZ_SERVICES_SYNC
+tier_app_dirs += services/crypto
+tier_app_dirs += services/sync
+endif
+
 tier_app_dirs += browser
+# Never add other tier_app_dirs after browser. They won't get packaged
+# properly on mac.
 
 installer:
 	@$(MAKE) -C browser/installer installer
 
 package:
 	@$(MAKE) -C browser/installer
 
 package-compare:

--- a/toolkit/toolkit-tiers.mk
+++ b/toolkit/toolkit-tiers.mk
@@ -281,20 +281,15 @@ endif
 ifdef MOZ_LEAKY
 tier_platform_dirs        += tools/leaky
 endif
 
 ifdef MOZ_MAPINFO
 tier_platform_dirs	+= tools/codesighs
 endif
 
-ifdef MOZ_SERVICES_SYNC
-tier_platform_dirs += services/crypto
-tier_platform_dirs += services/sync
-endif
-
 ifdef ENABLE_TESTS
 tier_platform_dirs += testing/mochitest
 tier_platform_dirs += testing/xpcshell 
 tier_platform_dirs += testing/mozmill
 tier_platform_dirs += testing/tools/screenshot
 endif