diff --git a/core/src/main/java/hudson/EnvVars.java b/core/src/main/java/hudson/EnvVars.java
index 56678ab7dcaba11d690be7f768a22af167c5e653..3cb2afe340fb81baa1e359fd8338c74348225420 100644
--- a/core/src/main/java/hudson/EnvVars.java
+++ b/core/src/main/java/hudson/EnvVars.java
@@ -185,7 +185,7 @@ public class EnvVars extends TreeMap<String,String> {
      * when we later kill the processes.
      */
     public static EnvVars createCookie() {
-        return new EnvVars("JENKINS_COOKIE", UUID.randomUUID().toString());
+        return new EnvVars("HUDSON_COOKIE", UUID.randomUUID().toString());
     }
 
     /**