diff --git a/lib/webmock/deprecation.rb b/lib/webmock/deprecation.rb
index 869f39fe4..cd3b793cc 100644
--- a/lib/webmock/deprecation.rb
+++ b/lib/webmock/deprecation.rb
@@ -2,7 +2,7 @@ module WebMock
   class Deprecation
     class << self
       def warning(message)
-        $stderr.puts "WebMock deprecation warning: #{message}"
+        warn "WebMock deprecation warning: #{message}"
       end
     end
   end
diff --git a/lib/webmock/webmock.rb b/lib/webmock/webmock.rb
index 603e9958e..96b6694f2 100644
--- a/lib/webmock/webmock.rb
+++ b/lib/webmock/webmock.rb
@@ -3,7 +3,7 @@ module WebMock
   def self.included(clazz)
     WebMock::Deprecation.warning("include WebMock is deprecated. Please include WebMock::API instead")
     if clazz.instance_methods.map(&:to_s).include?('request')
-      $stderr.puts "WebMock#request was not included in #{clazz} to avoid name collision"
+      warn "WebMock#request was not included in #{clazz} to avoid name collision"
     else
       clazz.class_eval do
         def request(method, uri)