Uses spaces instead of tabs
diff --git a/source/core-developers/using-visitor-field-validator.md b/source/core-developers/using-visitor-field-validator.md
index f097037..a167f86 100644
--- a/source/core-developers/using-visitor-field-validator.md
+++ b/source/core-developers/using-visitor-field-validator.md
@@ -38,15 +38,15 @@
 ```java
 public class VisitorValidatorsExampleAction extends AbstractValidationActionSupport {
 
-	private User user;
+    private User user;
 
-	public User getUser() {
-		return user;
-	}
+    public User getUser() {
+        return user;
+    }
 
-	public void setUser(User user) {
-		this.user = user;
-	}
+    public void setUser(User user) {
+        this.user = user;
+    }
 }
 ```