diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c1ac99..8feecb9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Edge
 
+- include invalid status code when raising handshake error
+
 ## 1.2.11
 
 - remove unused base64 require that would cause issues in Ruby 3.4
diff --git a/lib/websocket/error.rb b/lib/websocket/error.rb
index ec63e9f..bef5064 100644
--- a/lib/websocket/error.rb
+++ b/lib/websocket/error.rb
@@ -108,6 +108,12 @@ def message
       end
 
       class InvalidStatusCode < ::WebSocket::Error::Handshake
+        attr_reader :invalid_status_code
+
+        def initialize(invalid_status_code)
+          @invalid_status_code = invalid_status_code
+        end
+
         def message
           :invalid_status_code
         end
diff --git a/lib/websocket/handshake/client.rb b/lib/websocket/handshake/client.rb
index d1ae0e0..46a085a 100644
--- a/lib/websocket/handshake/client.rb
+++ b/lib/websocket/handshake/client.rb
@@ -123,7 +123,14 @@ def parse_first_line(line)
         line_parts = line.match(FIRST_LINE)
         raise WebSocket::Error::Handshake::InvalidHeader unless line_parts
         status = line_parts[1]
-        raise WebSocket::Error::Handshake::InvalidStatusCode unless status == '101'
+
+        # The signature for the error doesn't take the message as the first
+        # argument, but rather the status code. So this should use the
+        # initializer to create the error.
+        #
+        # rubocop:disable Style/RaiseArgs
+        raise WebSocket::Error::Handshake::InvalidStatusCode.new(status) unless status == '101'
+        # rubocop:enable Style/RaiseArgs
       end
     end
   end