diff --git a/code/BasicFieldsTestPage.php b/code/BasicFieldsTestPage.php
index ef5a54b..96fba9e 100644
--- a/code/BasicFieldsTestPage.php
+++ b/code/BasicFieldsTestPage.php
@@ -33,6 +33,7 @@
 use SilverStripe\Forms\CompositeField;
 use SilverStripe\Forms\Validation\RequiredFieldsValidator;
 use SilverStripe\Forms\HTMLReadonlyField;
+use SilverStripe\Core\Validation\ValidationResult;
 
 class BasicFieldsTestPage extends TestPage
 {
@@ -402,7 +403,7 @@ public function getCMSValidator()
         return new RequiredFieldsValidator('Required');
     }
 
-    public function validate()
+    public function validate(): ValidationResult
     {
         $result = parent::validate();
         if (!$this->Validated || $this->Validated < 1 || $this->Validated > 3) {
diff --git a/code/multitab-validation/MultiTabPage.php b/code/multitab-validation/MultiTabPage.php
index a3572c2..d068c52 100644
--- a/code/multitab-validation/MultiTabPage.php
+++ b/code/multitab-validation/MultiTabPage.php
@@ -6,6 +6,7 @@
 use SilverStripe\Forms\EmailField;
 use SilverStripe\Forms\Validation\RequiredFieldsValidator;
 use SilverStripe\Forms\TextField;
+use SilverStripe\Core\Validation\ValidationResult;
 
 if (!class_exists(Page::class)) {
     return;
@@ -59,7 +60,7 @@ public function getCMSValidator()
         ]);
     }
 
-    public function validate()
+    public function validate(): ValidationResult
     {
         $result = parent::validate();