diff --git a/benchmark/elapsed.go b/benchmark/elapsed.go
index 15d955a..396addd 100644
--- a/benchmark/elapsed.go
+++ b/benchmark/elapsed.go
@@ -1,13 +1,12 @@
 package benchmark
 
 import (
-	"fmt"
 	"time"
 )
 
-func Elapsed(what string) func() {
+func Elapsed() func() time.Duration {
 	start := time.Now()
-	return func() {
-		fmt.Printf("%s: %v", what, time.Since(start))
+	return func() time.Duration {
+		return time.Since(start)
 	}
 }