diff --git a/httpclient/src/main/java/org/apache/http/impl/client/AuthenticationStrategyImpl.java b/httpclient/src/main/java/org/apache/http/impl/client/AuthenticationStrategyImpl.java
index 7df3512ac..cd15aeabb 100644
--- a/httpclient/src/main/java/org/apache/http/impl/client/AuthenticationStrategyImpl.java
+++ b/httpclient/src/main/java/org/apache/http/impl/client/AuthenticationStrategyImpl.java
@@ -100,7 +100,7 @@ abstract class AuthenticationStrategyImpl implements AuthenticationStrategy {
 
     /**
      * Generates a map of challenge auth-scheme => Header entries.
-     * 
+     *
      * @return map: key=lower-cased auth-scheme name, value=Header that contains the challenge
      */
     @Override