diff --git a/backend/box/box.go b/backend/box/box.go
index 35ee52c27..7ad816ceb 100644
--- a/backend/box/box.go
+++ b/backend/box/box.go
@@ -1461,7 +1461,7 @@ func (f *Fs) changeNotifyRunner(ctx context.Context, notifyFunc func(string, fs.
 					// Item in the cache has the same or newer SequenceID than
 					// this event. Ignore this event, it must be old.
 					f.itemMetaCacheMu.Unlock()
-					fs.Debugf(f, "%s ignored due to old SequenceID (%q)", eventDetails, itemMeta.SequenceID)
+					fs.Debugf(f, "%s ignored due to old SequenceID (%d)", eventDetails, itemMeta.SequenceID)
 					continue
 				}
 
diff --git a/cmd/serve/s3/logger.go b/cmd/serve/s3/logger.go
index cb0337f95..73afc5bdf 100644
--- a/cmd/serve/s3/logger.go
+++ b/cmd/serve/s3/logger.go
@@ -26,10 +26,10 @@ func (l logger) Print(level gofakes3.LogLevel, v ...any) {
 	default:
 		fallthrough
 	case gofakes3.LogErr:
-		fs.Errorf("serve s3", s)
+		fs.Errorf("serve s3", "%s", s)
 	case gofakes3.LogWarn:
-		fs.Infof("serve s3", s)
+		fs.Infof("serve s3", "%s", s)
 	case gofakes3.LogInfo:
-		fs.Debugf("serve s3", s)
+		fs.Debugf("serve s3", "%s", s)
 	}
 }