diff --git a/spring-data-jpa/src/main/java/org/springframework/data/jpa/support/MergingPersistenceUnitManager.java b/spring-data-jpa/src/main/java/org/springframework/data/jpa/support/MergingPersistenceUnitManager.java
index f26e1f800..c729ba812 100644
--- a/spring-data-jpa/src/main/java/org/springframework/data/jpa/support/MergingPersistenceUnitManager.java
+++ b/spring-data-jpa/src/main/java/org/springframework/data/jpa/support/MergingPersistenceUnitManager.java
@@ -82,7 +82,7 @@ public class MergingPersistenceUnitManager extends DefaultPersistenceUnitManager
 			if (!pui.getMappingFileNames().contains(mappingFileName)) {
 
 				if (LOG.isDebugEnabled()) {
-					LOG.debug(String.format("Adding mapping file to persistence unit %s.", mappingFileName, persistenceUnitName));
+					LOG.debug(String.format("Adding mapping file %s to persistence unit %s.", mappingFileName, persistenceUnitName));
 				}
 				pui.addMappingFileName(mappingFileName);
 			}