diff --git a/src/main/java/org/springframework/samples/petclinic/web/PetValidator.java b/src/main/java/org/springframework/samples/petclinic/web/PetValidator.java
index 0621c98ab..5784278b9 100644
--- a/src/main/java/org/springframework/samples/petclinic/web/PetValidator.java
+++ b/src/main/java/org/springframework/samples/petclinic/web/PetValidator.java
@@ -58,7 +58,7 @@ public class PetValidator implements Validator {
      */
     @Override
     public boolean supports(Class<?> clazz) {
-        return Pet.class.equals(clazz);
+        return Pet.class.isAssignableFrom(clazz);
     }