diff --git a/src/Drivers/ImageDriver.php b/src/Drivers/ImageDriver.php
index 4d6e4d20..17a660a5 100644
--- a/src/Drivers/ImageDriver.php
+++ b/src/Drivers/ImageDriver.php
@@ -105,5 +105,5 @@ public function quality(int $quality): self;
 
     public function format(string $format): self;
 
-    public function optimize(OptimizerChain $optimizerChain): self;
+    public function optimize(?OptimizerChain $optimizerChain = null): self;
 }
diff --git a/src/Image.php b/src/Image.php
index cc878add..ec1c6282 100644
--- a/src/Image.php
+++ b/src/Image.php
@@ -311,7 +311,7 @@ public function format(string $format): ImageDriver
         return $this;
     }
 
-    public function optimize(OptimizerChain $optimizerChain): ImageDriver
+    public function optimize(?OptimizerChain $optimizerChain = null): ImageDriver
     {
         $this->imageDriver->optimize($optimizerChain);