diff --git a/testing/helper/helper.go b/testing/helper/helper.go
index 66fd63a..f1c591d 100644
--- a/testing/helper/helper.go
+++ b/testing/helper/helper.go
@@ -95,5 +95,5 @@ func RandBool() bool {
 }
 
 func RandInt(from, to int) int {
-	return from + rand.Intn(to+1)
+	return from + rand.Intn((to-from)+1)
 }