diff --git a/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/RFC5424Layout.java b/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/RFC5424Layout.java
index e7aff72..d7e43c9 100644
--- a/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/RFC5424Layout.java
+++ b/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/RFC5424Layout.java
@@ -324,7 +324,7 @@ public class RFC5424Layout extends AbstractStringLayout {
 
     private void appendMessage(final StringBuilder buffer, final LogEvent event) {
         final Message message = event.getMessage();
-        final String text = message.getFormat();
+        final String text = message.getFormattedMessage();
 
         if (text != null && text.length() > 0) {
             buffer.append(" ").append(escapeNewlines(text, escapeNewLine));