diff --git a/lib/REST.php b/lib/REST.php
index d8dce62..f7818e5 100644
--- a/lib/REST.php
+++ b/lib/REST.php
@@ -86,7 +86,7 @@ class REST {
             // create a request object if not provided
             $req = $req ?? ServerRequestFactory::fromGlobals();
             // find the API to handle
-            [$api, $target, $class] = $this->apiMatch($req->getRequestTarget(), $this->apis);
+            [, $target, $class] = $this->apiMatch($req->getRequestTarget(), $this->apis);
             // authenticate the request pre-emptively
             $req = $this->authenticateRequest($req);
             // modify the request to have an uppercase method and a stripped target
diff --git a/tests/cases/TestArsse.php b/tests/cases/TestArsse.php
index 2173db8..f7e4e8e 100644
--- a/tests/cases/TestArsse.php
+++ b/tests/cases/TestArsse.php
@@ -6,6 +6,7 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse\TestCase;
 
+use JKingWeb\Arsse\Exception;
 use JKingWeb\Arsse\Arsse;
 use JKingWeb\Arsse\Conf;
 use JKingWeb\Arsse\Lang;
@@ -47,4 +48,21 @@ class TestArsse extends \JKingWeb\Arsse\Test\AbstractTest {
         $this->assertInstanceOf(Database::class, Arsse::$db);
         $this->assertInstanceOf(User::class, Arsse::$user);
     }
+
+    /** @dataProvider provideExtensionChecks */
+    public function testCheckForExtensions(array $ext, $exp): void {
+        if ($exp instanceof \Exception) {
+            $this->assertException($exp);
+            Arsse::checkExtensions(...$ext);
+        } else {
+            $this->assertNull(Arsse::checkExtensions(...$ext));
+        }
+    }
+
+    public function provideExtensionChecks(): iterable {
+        return [
+            [["pcre"], null],
+            [["foo", "bar", "baz"], new Exception("extMissing", ['first' => "foo", 'total' => 3])],
+        ];
+    }
 }