diff --git a/objstore.go b/objstore.go
index 316650ba..00303ec7 100644
--- a/objstore.go
+++ b/objstore.go
@@ -667,7 +667,7 @@ type timingReadCloser struct {
 	writtenBytes      *prometheus.CounterVec
 }
 
-func newTimingReadCloser(rc io.ReadCloser, op string, dur *prometheus.HistogramVec, failed *prometheus.CounterVec, isFailureExpected IsOpFailureExpectedFunc, fetchedBytes *prometheus.CounterVec, writtenBytes *prometheus.CounterVec, transferredBytes *prometheus.HistogramVec) *timingReadCloser {
+func newTimingReadCloser(rc io.ReadCloser, op string, dur *prometheus.HistogramVec, failed *prometheus.CounterVec, isFailureExpected IsOpFailureExpectedFunc, fetchedBytes *prometheus.CounterVec, transferredBytes *prometheus.HistogramVec, writtenBytes *prometheus.CounterVec) *timingReadCloser {
 	// Initialize the metrics with 0.
 	dur.WithLabelValues(op)
 	failed.WithLabelValues(op)