diff --git a/rewriter/src/main/java/com/facebook/coresql/rewriter/RewriteResult.java b/rewriter/src/main/java/com/facebook/coresql/rewriter/RewriteResult.java
index a8e4098..2dfa209 100644
--- a/rewriter/src/main/java/com/facebook/coresql/rewriter/RewriteResult.java
+++ b/rewriter/src/main/java/com/facebook/coresql/rewriter/RewriteResult.java
@@ -21,8 +21,8 @@
 
 public class RewriteResult
 {
-    private String nameOfRewrite;
-    private String rewrittenSql;
+    private final String nameOfRewrite;
+    private final String rewrittenSql;
 
     @JsonCreator
     public RewriteResult(