diff --git a/cmd/kv-write-canary/main.go b/cmd/kv-write-canary/main.go
index 11cc988..7db4551 100644
--- a/cmd/kv-write-canary/main.go
+++ b/cmd/kv-write-canary/main.go
@@ -37,7 +37,7 @@ func main() {
 	for i, span := range spans.Spans {
 		log.Printf("[%d] (%vs) %v .. %v", i, int(span[1].Sub(span[0]).Seconds()), span[0].Format(format), span[1].Format(format))
 		if i < len(spans.Spans)-1 {
-			log.Printf("[%d] (%s...)", i, int(spans.Spans[i+1][0].Sub(span[1]).Seconds()))
+			log.Printf("[%d] (%vs...)", i, int(spans.Spans[i+1][0].Sub(span[1]).Seconds()))
 		}
 	}