diff --git a/src/main/java/org/springframework/data/jpa/repository/query/AbstractJpaQuery.java b/src/main/java/org/springframework/data/jpa/repository/query/AbstractJpaQuery.java
index 3d4a82379..7d2e0729e 100644
--- a/src/main/java/org/springframework/data/jpa/repository/query/AbstractJpaQuery.java
+++ b/src/main/java/org/springframework/data/jpa/repository/query/AbstractJpaQuery.java
@@ -325,7 +325,8 @@ public abstract class AbstractJpaQuery implements RepositoryQuery {
 		 */
 		private static class TupleBackedMap implements Map<String, Object> {
 
-			public static final String UNMODIFIABLE_MESSAGE = "A TupleBackedMap cannot be modified.";
+			private static final String UNMODIFIABLE_MESSAGE = "A TupleBackedMap cannot be modified.";
+
 			private final Tuple tuple;
 
 			TupleBackedMap(Tuple tuple) {