diff --git a/src/Support/Classify.php b/src/Support/Classify.php
index 16bdbafa..1533d6ba 100644
--- a/src/Support/Classify.php
+++ b/src/Support/Classify.php
@@ -73,7 +73,7 @@ public function method($name, $body, $options = [])
 
     public function mixin($class)
     {
-        if (Str::startsWith('\\', $class)) {
+        if (Str::startsWith($class, '\\')) {
             $class = Str::replaceFirst('\\', '', $class);
         }