diff --git a/Jenkinsfile b/Jenkinsfile
index f8c1a6f..39b2a84 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -4,7 +4,7 @@ pipeline {
     options {
         buildDiscarder(
             logRotator(
-                numToKeep: '5'
+                numToKeepStr: '5'
             )
         )
     }