diff --git a/api/handler/get.go b/api/handler/get.go
index e8eb73f1..eaef90a9 100644
--- a/api/handler/get.go
+++ b/api/handler/get.go
@@ -69,7 +69,7 @@ func writeHeaders(h http.Header, info *layer.ObjectInfo) {
 	h.Set(api.ETag, info.HashSum)
 
 	for key, val := range info.Headers {
-		h.Set("X-"+key, val)
+		h.Set(api.MetadataPrefix+key, val)
 	}
 }