diff --git a/java/src/org/openqa/selenium/net/UrlChecker.java b/java/src/org/openqa/selenium/net/UrlChecker.java
index 1392d3dc204b2..a476f5567aad6 100644
--- a/java/src/org/openqa/selenium/net/UrlChecker.java
+++ b/java/src/org/openqa/selenium/net/UrlChecker.java
@@ -189,6 +189,8 @@ private HttpURLConnection connectToUrl(URL url) throws IOException {
   }
 
   public static class TimeoutException extends Exception {
+    private static final long serialVersionUID = 1L;
+
     public TimeoutException(String s, Throwable throwable) {
       super(s, throwable);
     }