diff --git a/src/BrowsershotRenderer.php b/src/BrowsershotRenderer.php
index d6a75b5..0af845f 100644
--- a/src/BrowsershotRenderer.php
+++ b/src/BrowsershotRenderer.php
@@ -48,9 +48,9 @@ public function render(Html $html, Css $css, Options $options, Config $config =
         $this->options = $options;
         $this->config = $config ?? $this->config;
 
-        [$paperWidth, $paperHeight] = $this->options->resolvePaperSize(LengthUnit::MILLIMETER_UNIT);
+        [$paperWidth, $paperHeight] = $this->options->resolvePaperSize(LengthUnit::MILLIMETER);
 
-        $margin = Margin::fromOptions($this->options)->allRawIn(LengthUnit::MILLIMETER_UNIT);
+        $margin = Margin::fromOptions($this->options)->allRawIn(LengthUnit::MILLIMETER);
 
         $browsershot = Browsershot::html($this->html())
             ->newHeadless()