diff --git a/bench/bench.go b/bench/bench.go
index e75f30f80..28a85c111 100644
--- a/bench/bench.go
+++ b/bench/bench.go
@@ -139,25 +139,3 @@ func Serial(bs ...Benchmark) Benchmark {
 		benchmarkers: bs,
 	}
 }
-
-// wrapper type to force human-readable JSON output
-type PrettyDuration time.Duration
-
-func (d PrettyDuration) MarshalJSON() ([]byte, error) {
-	s := time.Duration(d).String()
-	return []byte("\"" + s + "\""), nil
-}
-
-// Recursively replaces elements of ugly types with their pretty wrappers
-func Prettify(m map[string]interface{}) map[string]interface{} {
-	newmap := make(map[string]interface{})
-	for k, v := range m {
-		switch v.(type) {
-		case time.Duration:
-			newmap[k] = PrettyDuration(v.(time.Duration))
-		default:
-			newmap[k] = Prettify(v.(map[string]interface{}))
-		}
-	}
-	return newmap
-}
diff --git a/bench/prettify.go b/bench/prettify.go
new file mode 100644
index 000000000..f9fdb04bf
--- /dev/null
+++ b/bench/prettify.go
@@ -0,0 +1,27 @@
+package bench
+
+import (
+	"time"
+)
+
+// wrapper type to force human-readable JSON output
+type PrettyDuration time.Duration
+
+func (d PrettyDuration) MarshalJSON() ([]byte, error) {
+	s := time.Duration(d).String()
+	return []byte("\"" + s + "\""), nil
+}
+
+// Recursively replaces elements of ugly types with their pretty wrappers
+func Prettify(m map[string]interface{}) map[string]interface{} {
+	newmap := make(map[string]interface{})
+	for k, v := range m {
+		switch v.(type) {
+		case time.Duration:
+			newmap[k] = PrettyDuration(v.(time.Duration))
+		default:
+			newmap[k] = Prettify(v.(map[string]interface{}))
+		}
+	}
+	return newmap
+}