diff --git a/src/Psalm/Type/Union.php b/src/Psalm/Type/Union.php
index 0e887334d..c8ecd8cb1 100644
--- a/src/Psalm/Type/Union.php
+++ b/src/Psalm/Type/Union.php
@@ -873,7 +873,9 @@ class Union
                                     $input_atomic_type->param_name,
                                     $input_atomic_type->as_type
                                         ? new Union([$input_atomic_type->as_type])
-                                        : Type::getMixed()
+                                        : ($input_atomic_type->as === 'object'
+                                            ? Type::getObject()
+                                            : Type::getMixed())
                                 );
                             }
                         }
diff --git a/tests/Template/TemplateTest.php b/tests/Template/TemplateTest.php
index c94fa584c..f7212cd62 100644
--- a/tests/Template/TemplateTest.php
+++ b/tests/Template/TemplateTest.php
@@ -1508,6 +1508,57 @@ class TemplateTest extends TestCase
 
                     echo Foo(DateTime::class)->format("c");',
             ],
+            'genericInterface' => [
+                '<?php
+                    /**
+                     * @template T as object
+                     * @param class-string<T> $t
+                     * @return T
+                     */
+                    function generic(string $t) {
+                        return f($t)->get();
+                    }
+
+                    /** @template T as object */
+                    interface I {
+                        /** @return T */
+                        public function get() {}
+                    }
+
+                    /**
+                     * @template T as object
+                     * @template-implements I<T>
+                     */
+                    class C implements I {
+                        /**
+                         * @var T
+                         */
+                        public $t;
+
+                        /**
+                         * @param T $t
+                         */
+                        public function __construct(object $t) {
+                            $this->t = $t;
+                        }
+
+                        /**
+                         * @return T
+                         */
+                        public function get() {
+                            return $this->t;
+                        }
+                    }
+
+                    /**
+                     * @template T as object
+                     * @param class-string<T> $t
+                     * @return I<T>
+                     */
+                    function f(string $t) {
+                        return new C(new $t);
+                    }',
+            ],
         ];
     }