diff --git a/node/api.go b/node/api.go
index 989d3884ac..117b76b6d8 100644
--- a/node/api.go
+++ b/node/api.go
@@ -343,13 +343,13 @@ func (api *PublicDebugAPI) Metrics(raw bool) (map[string]interface{}, error) {
 				ps := t.Percentiles([]float64{5, 20, 50, 80, 95})
 				root[name] = map[string]interface{}{
 					"Measurements": len(t.Values()),
-					"Mean":         time.Duration(t.Mean()).String(),
+					"Mean":         t.Mean(),
 					"Percentiles": map[string]interface{}{
-						"5":  time.Duration(ps[0]).String(),
-						"20": time.Duration(ps[1]).String(),
-						"50": time.Duration(ps[2]).String(),
-						"80": time.Duration(ps[3]).String(),
-						"95": time.Duration(ps[4]).String(),
+						"5":  ps[0],
+						"20": ps[1],
+						"50": ps[2],
+						"80": ps[3],
+						"95": ps[4],
 					},
 				}