diff --git a/client.go b/client.go
index 8f2f92c..f326c80 100644
--- a/client.go
+++ b/client.go
@@ -10,11 +10,11 @@ import (
 	"strings"
 	"time"
 
-	"github.com/redis/go-redis/v9"
 	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
 	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/redis/go-redis/v9"
 )
 
 // A Client is responsible for scheduling tasks.
@@ -150,9 +150,9 @@ func (t deadlineOption) Value() interface{} { return time.Time(t) }
 // TTL duration must be greater than or equal to 1 second.
 //
 // Uniqueness of a task is based on the following properties:
-//     - Task Type
-//     - Task Payload
-//     - Queue Name
+//   - Task Type
+//   - Task Payload
+//   - Queue Name
 func Unique(ttl time.Duration) Option {
 	return uniqueOption(ttl)
 }
@@ -414,7 +414,7 @@ func (c *Client) enqueue(ctx context.Context, msg *base.TaskMessage, uniqueTTL t
 
 func (c *Client) schedule(ctx context.Context, msg *base.TaskMessage, t time.Time, uniqueTTL time.Duration) error {
 	if uniqueTTL > 0 {
-		ttl := t.Add(uniqueTTL).Sub(time.Now())
+		ttl := time.Until(t.Add(uniqueTTL))
 		return c.broker.ScheduleUnique(ctx, msg, t, ttl)
 	}
 	return c.broker.Schedule(ctx, msg, t)
diff --git a/client_test.go b/client_test.go
index da24d13..76f24fe 100644
--- a/client_test.go
+++ b/client_test.go
@@ -1158,7 +1158,7 @@ func TestClientEnqueueUniqueWithProcessAtOption(t *testing.T) {
 		}
 
 		gotTTL := r.TTL(context.Background(), base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
-		wantTTL := tc.at.Add(tc.ttl).Sub(time.Now())
+		wantTTL := time.Until(tc.at.Add(tc.ttl))
 		if !cmp.Equal(wantTTL.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 			t.Errorf("TTL = %v, want %v", gotTTL, wantTTL)
 			continue
diff --git a/internal/rdb/inspect.go b/internal/rdb/inspect.go
index 632e06b..1ffe207 100644
--- a/internal/rdb/inspect.go
+++ b/internal/rdb/inspect.go
@@ -10,9 +10,9 @@ import (
 	"strings"
 	"time"
 
-	"github.com/redis/go-redis/v9"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
+	"github.com/redis/go-redis/v9"
 	"github.com/spf13/cast"
 )
 
@@ -343,7 +343,7 @@ func (r *RDB) memoryUsage(qname string) (int64, error) {
 	}
 	usg, err := cast.ToInt64E(res)
 	if err != nil {
-		return 0, errors.E(op, errors.Internal, fmt.Sprintf("could not cast script return value to int64"))
+		return 0, errors.E(op, errors.Internal, "could not cast script return value to int64")
 	}
 	return usg, nil
 }
diff --git a/servemux.go b/servemux.go
index c11fbce..3c53f1a 100644
--- a/servemux.go
+++ b/servemux.go
@@ -144,9 +144,7 @@ func (mux *ServeMux) HandleFunc(pattern string, handler func(context.Context, *T
 func (mux *ServeMux) Use(mws ...MiddlewareFunc) {
 	mux.mu.Lock()
 	defer mux.mu.Unlock()
-	for _, fn := range mws {
-		mux.mws = append(mux.mws, fn)
-	}
+	mux.mws = append(mux.mws, mws...)
 }
 
 // NotFound returns an error indicating that the handler was not found for the given task.
@@ -154,5 +152,5 @@ func NotFound(ctx context.Context, task *Task) error {
 	return fmt.Errorf("handler not found for task %q", task.Type())
 }
 
-// NotFoundHandler returns a simple task handler that returns a ``not found`` error.
+// NotFoundHandler returns a simple task handler that returns a “not found“ error.
 func NotFoundHandler() Handler { return HandlerFunc(NotFound) }