diff --git a/spec/mspec/lib/mspec/utils/warnings.rb b/spec/mspec/lib/mspec/utils/warnings.rb
index c770d609f3..0d3d36fada 100644
--- a/spec/mspec/lib/mspec/utils/warnings.rb
+++ b/spec/mspec/lib/mspec/utils/warnings.rb
@@ -10,7 +10,7 @@ if Object.const_defined?(:Warning) and Warning.respond_to?(:[]=)
 end
 
 if Object.const_defined?(:Warning) and Warning.respond_to?(:warn)
-  def Warning.warn(message)
+  def Warning.warn(message, category: nil)
     # Suppress any warning inside the method to prevent recursion
     verbose = $VERBOSE
     $VERBOSE = nil