diff --git a/jota/src/main/java/jota/utils/InputValidator.java b/jota/src/main/java/jota/utils/InputValidator.java
index 052c34c..4a72f77 100644
--- a/jota/src/main/java/jota/utils/InputValidator.java
+++ b/jota/src/main/java/jota/utils/InputValidator.java
@@ -235,7 +235,7 @@ public class InputValidator {
 
             String lastTrytes = tryteValue.substring(2673 - (3 * 81));
 
-            if (lastTrytes.matches("[9]+")) {
+            if (isNinesTrytes(lastTrytes, lastTrytes.length())) {
                 return false;
             }
         }