diff --git a/src/JsonSchema/Validator.php b/src/JsonSchema/Validator.php
index 86440949..b2cff492 100644
--- a/src/JsonSchema/Validator.php
+++ b/src/JsonSchema/Validator.php
@@ -60,6 +60,8 @@ public function validate(&$value, $schema = null, $checkMode = null)
         // add provided schema to SchemaStorage with internal URI to allow internal $ref resolution
         if (is_object($schema) && property_exists($schema, 'id')) {
             $schemaURI = $schema->id;
+        } elseif (is_array($schema) && array_key_exists('id', $schema)) {
+            $schemaURI = $schema['id'];
         } else {
             $schemaURI = SchemaStorage::INTERNAL_PROVIDED_SCHEMA_URI;
         }
diff --git a/tests/ValidatorTest.php b/tests/ValidatorTest.php
index 26a8069d..9f536384 100644
--- a/tests/ValidatorTest.php
+++ b/tests/ValidatorTest.php
@@ -18,6 +18,17 @@ public function testValidateWithAssocSchema(): void
         $this->assertFalse($validator->isValid(), 'Validation succeeded, but should have failed.');
     }
 
+    public function testValidateWithAssocSchemaWithRelativeRefs(): void
+    {
+        $schema = json_decode(file_get_contents(__DIR__ . '/fixtures/relative.json'), true);
+        $data = json_decode('{"foo":{"foo": "bar"}}', false);
+
+        $validator = new Validator();
+        $validator->validate($data, $schema);
+
+        $this->assertTrue($validator->isValid(), 'Validation failed, but should have succeeded.');
+    }
+
     public function testBadAssocSchemaInput(): void
     {
         if (version_compare(phpversion(), '5.5.0', '<')) {
diff --git a/tests/fixtures/relative.json b/tests/fixtures/relative.json
new file mode 100644
index 00000000..f07531b2
--- /dev/null
+++ b/tests/fixtures/relative.json
@@ -0,0 +1,11 @@
+{
+    "id": "tests/fixtures/relative.json",
+    "type": "object",
+    "properties": {
+        "foo": {
+            "$ref": "foobar.json"
+        }
+    },
+    "required": ["foo"],
+    "additionalProperties": false
+}