diff --git a/core-java-modules/core-java-9/src/modules/com.baeldung.logging.slf4j/com/baeldung/logging/slf4j/Slf4jLogger.java b/core-java-modules/core-java-9/src/modules/com.baeldung.logging.slf4j/com/baeldung/logging/slf4j/Slf4jLogger.java
index df41e071fd..aaa2d83ca6 100644
--- a/core-java-modules/core-java-9/src/modules/com.baeldung.logging.slf4j/com/baeldung/logging/slf4j/Slf4jLogger.java
+++ b/core-java-modules/core-java-9/src/modules/com.baeldung.logging.slf4j/com/baeldung/logging/slf4j/Slf4jLogger.java
@@ -75,6 +75,8 @@ public class Slf4jLogger implements System.Logger {
             return;
         }
 
+        String message = MessageFormat.format(format, params);
+
         switch (level) {
         case TRACE:
             logger.trace(format, params);