diff --git a/clientv3/concurrency/example_stm_test.go b/clientv3/concurrency/example_stm_test.go
index d49862c7d..54c871d36 100644
--- a/clientv3/concurrency/example_stm_test.go
+++ b/clientv3/concurrency/example_stm_test.go
@@ -58,7 +58,7 @@ func ExampleSTM_apply() {
 
 		// transfer amount
 		xfer := fromInt / 2
-		fromInt, toInt = fromInt-xfer, toInt-xfer
+		fromInt, toInt = fromInt-xfer, toInt+xfer
 
 		// writeback
 		stm.Put(fromK, fmt.Sprintf("%d", fromInt))