diff --git a/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java b/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java
index 46dba1a..464bdab 100644
--- a/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java
+++ b/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java
@@ -442,7 +442,7 @@ public class ValidationEditorController extends FXMLController {
             ruleEnabled.setSelected(false);
         } else {
             ruleEnabled.setSelected(true);
-            rule.replaceText(0, 0, value);
+            rule.replaceText(0, rule.getLength(), value);
         }
     }