diff --git a/lib/ferrum/page/screenshot.rb b/lib/ferrum/page/screenshot.rb
index f7adcb5f..90cdf1a7 100644
--- a/lib/ferrum/page/screenshot.rb
+++ b/lib/ferrum/page/screenshot.rb
@@ -224,9 +224,7 @@ def format_options(format, path, quality)
 
         format ||= DEFAULT_SCREENSHOT_FORMAT
         format = format.to_s
-        unless SUPPORTED_SCREENSHOT_FORMAT.include?(format)
-          raise Ferrum::InvalidScreenshotFormatError, format
-        end
+        raise Ferrum::InvalidScreenshotFormatError, format unless SUPPORTED_SCREENSHOT_FORMAT.include?(format)
 
         format = "jpeg" if format == "jpg"