diff --git a/.test-infra/jenkins/CommonJobProperties.groovy b/.test-infra/jenkins/CommonJobProperties.groovy
index 40f143a..851fc0b 100644
--- a/.test-infra/jenkins/CommonJobProperties.groovy
+++ b/.test-infra/jenkins/CommonJobProperties.groovy
@@ -49,7 +49,7 @@
 
     // Discard old builds. Build records are only kept up to this number of days.
     context.logRotator {
-      daysToKeep(14)
+      daysToKeep(30)
     }
 
     // Source code management.