diff --git a/src/main/java/org/springframework/samples/petclinic/owner/Owner.java b/src/main/java/org/springframework/samples/petclinic/owner/Owner.java
index ac556459d..b7594394c 100644
--- a/src/main/java/org/springframework/samples/petclinic/owner/Owner.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/Owner.java
@@ -18,6 +18,7 @@ package org.springframework.samples.petclinic.owner;
 import java.util.ArrayList;
 import java.util.List;
 
+import jakarta.validation.constraints.Pattern;
 import org.springframework.core.style.ToStringCreator;
 import org.springframework.samples.petclinic.model.Person;
 import org.springframework.util.Assert;
@@ -57,6 +58,7 @@ public class Owner extends Person {
 	@Column(name = "telephone")
 	@NotEmpty
 	@Digits(fraction = 0, integer = 10)
+	@Pattern(regexp = "\\d{10,}", message = "Telephone must have at least 10 digits")
 	private String telephone;
 
 	@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)