diff --git a/src/main/java/cz/jirutka/rsql/parser/ast/ComparisonNode.java b/src/main/java/cz/jirutka/rsql/parser/ast/ComparisonNode.java
index 302d276..71658cc 100644
--- a/src/main/java/cz/jirutka/rsql/parser/ast/ComparisonNode.java
+++ b/src/main/java/cz/jirutka/rsql/parser/ast/ComparisonNode.java
@@ -96,7 +96,9 @@ public String getSelector() {
      * @return a copy of this node with the specified selector.
      */
     public ComparisonNode withSelector(String newSelector) {
-        return new ComparisonNode(operator, newSelector, arguments, true);
+        return selector.equals(newSelector)
+        ? this
+        : new ComparisonNode(operator, newSelector, arguments, true);
     }
 
     /**
diff --git a/src/test/groovy/cz/jirutka/rsql/parser/ast/ComparisonNodeTest.groovy b/src/test/groovy/cz/jirutka/rsql/parser/ast/ComparisonNodeTest.groovy
index 3d543c2..29cae9b 100644
--- a/src/test/groovy/cz/jirutka/rsql/parser/ast/ComparisonNodeTest.groovy
+++ b/src/test/groovy/cz/jirutka/rsql/parser/ast/ComparisonNodeTest.groovy
@@ -83,6 +83,17 @@ class ComparisonNodeTest extends Specification {
         argsField.get(actual2) is(rawArguments)
     }
 
+    def 'should not copy node when not needed'() {
+        given:
+        def node = new ComparisonNode(IN, 'genres', ['thriller', 'sci-fi'])
+
+        when:
+        def actual1 = node.withSelector(node.selector)
+
+        then:
+        actual1.is(node)
+    }
+
     def 'should create proper toString representation'() {
         expect:
         node.toString() == expected