diff --git a/core/src/main/java/hudson/Launcher.java b/core/src/main/java/hudson/Launcher.java
index c7f26b10dcfd13ec1322322cfcd9a0e4cdd78b7f..2125169deda7c9b07de6cc3b91d53778bd8e627b 100644
--- a/core/src/main/java/hudson/Launcher.java
+++ b/core/src/main/java/hudson/Launcher.java
@@ -256,7 +256,7 @@ public abstract class Launcher {
         final String[] masked = new String[cmd.length];
         for (int i = 0; i < cmd.length; i++) {
             if (mask[i]) {
-                masked[i] = "********************************************************".substring(0, cmd[i].length());
+                masked[i] = "********";
             } else {
                 masked[i] = cmd[i];
             }