diff --git a/src/FileGenerators/InterfaceGenerator.php b/src/FileGenerators/InterfaceGenerator.php
index c0e4451..99e0a3d 100644
--- a/src/FileGenerators/InterfaceGenerator.php
+++ b/src/FileGenerators/InterfaceGenerator.php
@@ -63,6 +63,19 @@ public function generate(): Node
         $class = $factory->interface($className)
             ->extend('ResourceInterface');
 
+        $class->addStmt(
+            new Node\Stmt\ClassConst(
+                [
+                    new Node\Const_(
+                        'HYDRATE_CLASS',
+                        new Node\Scalar\String_(
+                            $this->yaml['class']
+                        )
+                    )
+                ]
+            )
+        );
+
         foreach ($this->yaml['properties'] as $name => $details) {
             $type = $details;
             if (is_array($details)) {
diff --git a/tests/expected-app/src/Resources/Project/BuildInterface.php b/tests/expected-app/src/Resources/Project/BuildInterface.php
index cf81e6a..85a5026 100644
--- a/tests/expected-app/src/Resources/Project/BuildInterface.php
+++ b/tests/expected-app/src/Resources/Project/BuildInterface.php
@@ -8,6 +8,8 @@
 
 interface BuildInterface extends ResourceInterface
 {
+    const HYDRATE_CLASS = 'Project\\Build';
+
     /**
      * @return int
      */
diff --git a/tests/expected-app/src/Resources/Project/ConfigInterface.php b/tests/expected-app/src/Resources/Project/ConfigInterface.php
index de6c220..355e605 100644
--- a/tests/expected-app/src/Resources/Project/ConfigInterface.php
+++ b/tests/expected-app/src/Resources/Project/ConfigInterface.php
@@ -6,6 +6,8 @@
 
 interface ConfigInterface extends ResourceInterface
 {
+    const HYDRATE_CLASS = 'Project\\Config';
+
     /**
      * @return string
      */
diff --git a/tests/expected-app/src/Resources/ProjectInterface.php b/tests/expected-app/src/Resources/ProjectInterface.php
index 2ebea67..a73fe4f 100644
--- a/tests/expected-app/src/Resources/ProjectInterface.php
+++ b/tests/expected-app/src/Resources/ProjectInterface.php
@@ -8,6 +8,8 @@
 
 interface ProjectInterface extends ResourceInterface
 {
+    const HYDRATE_CLASS = 'Project';
+
     /**
      * @return int
      */