diff --git a/core/src/main/java/hudson/FilePath.java b/core/src/main/java/hudson/FilePath.java
index c517b7548a..d2b7031dd2 100644
--- a/core/src/main/java/hudson/FilePath.java
+++ b/core/src/main/java/hudson/FilePath.java
@@ -176,6 +176,8 @@ public final class FilePath implements Serializable {
                     zip.closeEntry();
                 }
             }
+            
+            private static final long serialVersionUID = 1L;
         });
     }