diff --git a/spring-ldap/src/main/java/org/springframework/ldap/core/support/AbstractContextSource.java b/spring-ldap/src/main/java/org/springframework/ldap/core/support/AbstractContextSource.java
index fc5a9075..8fe1b214 100644
--- a/spring-ldap/src/main/java/org/springframework/ldap/core/support/AbstractContextSource.java
+++ b/spring-ldap/src/main/java/org/springframework/ldap/core/support/AbstractContextSource.java
@@ -127,8 +127,9 @@ public abstract class AbstractContextSource implements ContextSource, Initializi
 	 * @param env the environment to modify.
 	 */
 	protected void setupAuthenticatedEnvironment(Hashtable env) {
-		env.put(Context.SECURITY_PRINCIPAL, authenticationSource.getPrincipal());
-		log.debug("Principal: '" + userDn + "'");
+		String principal = authenticationSource.getPrincipal();
+		env.put(Context.SECURITY_PRINCIPAL, principal);
+		log.debug("Principal: '" + principal + "'");
 		env.put(Context.SECURITY_CREDENTIALS, authenticationSource.getCredentials());
 	}