diff --git a/Jamrules b/Jamrules
index 21a16f6487..d4d1a6d07d 100644
--- a/Jamrules
+++ b/Jamrules
@@ -382,7 +382,7 @@ rule UsePublicHeaders
 	local headers ;
 
 	for i in $(list) {
-		headers += [ FDirName $(OBOS_TOP) headers $(i) ] ;
+		headers += [ FDirName $(OBOS_TOP) headers os $(i) ] ;
 	}
 
 	UseHeaders $(headers) : $(targets) ;