diff --git a/src/Schema/Keywords/Properties.php b/src/Schema/Keywords/Properties.php
index 52ae621a..f250581f 100644
--- a/src/Schema/Keywords/Properties.php
+++ b/src/Schema/Keywords/Properties.php
@@ -108,7 +108,7 @@ public function validate($data, array $properties, $additionalProperties): void
             // if not covered by "properties"
             $schemaValidator->validate(
                 $data[$propName],
-                $additionalProperties,
+                $additionalProperties->properties[$propName] ?? $additionalProperties,
                 $this->dataBreadCrumb->addCrumb($propName)
             );
         }
diff --git a/tests/Schema/Keywords/PropertiesTest.php b/tests/Schema/Keywords/PropertiesTest.php
index 82a146e4..158f4926 100644
--- a/tests/Schema/Keywords/PropertiesTest.php
+++ b/tests/Schema/Keywords/PropertiesTest.php
@@ -120,4 +120,23 @@ public function testItInfersObjectTypeGreen(): void
         $this->expectException(KeywordMismatch::class);
         (new SchemaValidator())->validate($data, $schema);
     }
+
+    public function testItValidatesAdditionalPropertiesBlue(): void
+    {
+        $spec = <<<SPEC
+schema:
+  type: object
+  additionalProperties:
+    type: object
+    properties:
+      flag:
+        type: boolean
+SPEC;
+
+        $schema = $this->loadRawSchema($spec);
+        $data   = ['flag' => true];
+
+        (new SchemaValidator())->validate($data, $schema);
+        $this->addToAssertionCount(1);
+    }
 }