diff --git a/lib/Internal/LazyPromise.php b/lib/Internal/LazyPromise.php
index 54c72bf..f1ee791 100644
--- a/lib/Internal/LazyPromise.php
+++ b/lib/Internal/LazyPromise.php
@@ -35,7 +35,7 @@ class LazyPromise implements Promise {
             try {
                 $this->promise = $provider();
 
-                if ($this->promise instanceof Promise) {
+                if (!$this->promise instanceof Promise) {
                     $this->promise = new Success($this->promise);
                 }
             } catch (\Throwable $exception) {