diff --git a/core/src/main/java/hudson/model/Executor.java b/core/src/main/java/hudson/model/Executor.java
index b6c1f727c67c9ec8a022ac7505a53437d2f47e22..08864961ebd9c0f6d5cde2b5f29d208bbbd4ff03 100644
--- a/core/src/main/java/hudson/model/Executor.java
+++ b/core/src/main/java/hudson/model/Executor.java
@@ -642,7 +642,7 @@ public class Executor extends Thread implements ModelObject {
         } finally {
             lock.readLock().unlock();
         }
-        if (d < 0) {
+        if (d <= 0) {
             return -1;
         }