diff --git a/interleaver/main.go b/interleaver/main.go
index 85dd651..656023e 100644
--- a/interleaver/main.go
+++ b/interleaver/main.go
@@ -64,10 +64,10 @@ func copyProducerToConsumer(producer BlockProducer, consumer BlockConsumer) (err
 		}
 		i++
 		if i%1000 == 0 {
-			log.Printf("%i blocks transferred.\n", i)
+			log.Printf("%d blocks transferred.\n", i)
 		}
 	}
-	log.Printf("%i blocks transferred in total.\n", i)
+	log.Printf("%d blocks transferred in total.\n", i)
 
 	return
 }