diff --git a/src/time/tick.go b/src/time/tick.go
index dcfeca8783..9da16b5d58 100644
--- a/src/time/tick.go
+++ b/src/time/tick.go
@@ -4,8 +4,6 @@
 
 package time
 
-import "errors"
-
 // A Ticker holds a channel that delivers “ticks” of a clock
 // at intervals.
 type Ticker struct {
@@ -21,7 +19,7 @@ type Ticker struct {
 // panic. Stop the ticker to release associated resources.
 func NewTicker(d Duration) *Ticker {
 	if d <= 0 {
-		panic(errors.New("non-positive interval for NewTicker"))
+		panic("non-positive interval for NewTicker")
 	}
 	// Give the channel a 1-element time buffer.
 	// If the client falls behind while reading, we drop ticks