diff --git a/uid/assigner.go b/uid/assigner.go
index 8f8c5f3c67024923995c8cf0a5b16f0b20aa6186..19287ac37605687eb0ef73e3b5689a571081c129 100644
--- a/uid/assigner.go
+++ b/uid/assigner.go
@@ -94,8 +94,8 @@ func init() {
 
 func allocateUniqueUid(xid string, instanceIdx uint64, numInstances uint64) (uid uint64, rerr error) {
 
-	minIdx := instanceIdx * math.MaxUint64 / numInstances
 	mod := math.MaxUint64 / numInstances
+	minIdx := instanceIdx * math.MaxUint64 / numInstances
 
 	for sp := ""; ; sp += " " {
 		txid := xid + sp