diff --git a/Jamrules b/Jamrules
index 5e96d1e626..f455c63873 100644
--- a/Jamrules
+++ b/Jamrules
@@ -658,6 +658,7 @@ rule SetupKernel
 	UsePublicHeaders kernel ;
 	UsePublicHeaders [ FDirName os kernel ] ;
 	UsePrivateHeaders kernel ;
+	UsePosixHeaders ;
 	UseArchHeaders $(OBOS_ARCH) ;
 
 	SetupObjectsDir ;