diff --git a/src/main/java/org/apache/commons/logging/impl/Jdk13LumberjackLogger.java b/src/main/java/org/apache/commons/logging/impl/Jdk13LumberjackLogger.java
index f52cfe2..83109dc 100644
--- a/src/main/java/org/apache/commons/logging/impl/Jdk13LumberjackLogger.java
+++ b/src/main/java/org/apache/commons/logging/impl/Jdk13LumberjackLogger.java
@@ -161,7 +161,7 @@ public class Jdk13LumberjackLogger implements Log, Serializable {
             final StringWriter stringWriter = new StringWriter();
             final PrintWriter printWriter = new PrintWriter(stringWriter);
             throwable.printStackTrace(printWriter);
-            final String traceString = stringWriter.getBuffer().toString();
+            final String traceString = stringWriter.toString();
             final StringTokenizer tokenizer = new StringTokenizer(traceString, "\n");
             tokenizer.nextToken();
             String line = tokenizer.nextToken();