diff --git a/spring-expression/src/main/java/org/springframework/expression/spel/ast/Indexer.java b/spring-expression/src/main/java/org/springframework/expression/spel/ast/Indexer.java
index b1fbc3225ad..a2f1df38cd7 100644
--- a/spring-expression/src/main/java/org/springframework/expression/spel/ast/Indexer.java
+++ b/spring-expression/src/main/java/org/springframework/expression/spel/ast/Indexer.java
@@ -768,7 +768,7 @@ public class Indexer extends SpelNodeImpl {
 
 		@Override
 		public boolean isWritable() {
-			return true;
+			return false;
 		}
 	}