diff --git a/build/mac/NGLayoutBuildList.pm b/build/mac/NGLayoutBuildList.pm
index c0a566b9eb5c..b5ee7dc478e1 100644
--- a/build/mac/NGLayoutBuildList.pm
+++ b/build/mac/NGLayoutBuildList.pm
@@ -724,7 +724,7 @@ sub BuildXPAppProjects()
 
 	BuildOneProject(":mozilla:xpfe:appshell:macbuild:AppShell.mcp",				"AppShell$D.shlb", "AppShell.toc", 1, $main::ALIAS_SYM_FILES, 0);
 
-	BuildOneProject(":mozilla:xpfe:AppCores:macbuild:AppCores.mcp",				"AppCores$D.shlb", "AppCores.toc", 1, $main::ALIAS_SYM_FILES, 1);
+	BuildOneProject(":mozilla:xpfe:AppCores:macbuild:AppCores.mcp",				"AppCores$D.shlb", "AppCores.toc", 1, $main::ALIAS_SYM_FILES, 0);
 
 	BuildOneProject(":mozilla:xpfe:bootstrap:macbuild:apprunner.mcp",			"apprunner$D", "apprunner.toc", 0, 0, 1);