diff --git a/pkg/process/debug.go b/pkg/process/debug.go
index f28042eb5..d682a2c74 100644
--- a/pkg/process/debug.go
+++ b/pkg/process/debug.go
@@ -84,6 +84,7 @@ func prometheus(w http.ResponseWriter, r *http.Request) {
 	// (https://prometheus.io/docs/concepts/metric_types/)
 	monkit.Default.Stats(func(name string, val float64) {
 		metric := sanitize(name)
-		_, _ = fmt.Fprintf(w, "%s %g\n", metric, val)
+		_, _ = fmt.Fprintf(w, "# TYPE %s gauge\n%s %g\n",
+			metric, metric, val)
 	})
 }