diff --git a/tools/serial/algorithm.go b/tools/serial/algorithm.go
index 8bd08ec..91858e8 100644
--- a/tools/serial/algorithm.go
+++ b/tools/serial/algorithm.go
@@ -32,7 +32,7 @@ func init() {
 				if timestamp != lastTimestamp {
 					lastSerial = 0
 				}
-				lastSerial := lastSerial + 1
+				lastSerial = lastSerial + 1
 				uniqueId := generateSerial(timestamp, lastSerial)
 				SerialResponseChan <- uniqueId
 				lastTimestamp = timestamp
@@ -42,7 +42,7 @@ func init() {
 				if timestamp != lastTimestamp {
 					lastSerial = 0
 				}
-				lastSerial := lastSerial + 1
+				lastSerial = lastSerial + 1
 				uniqueId := generateStringSerial(timestamp, lastSerial)
 				StringSerialResponseChan <- uniqueId
 				lastTimestamp = timestamp