diff --git a/extensions/ruby/package.json b/extensions/ruby/package.json
index 7b1bf81aac6..e06a400ad22 100644
--- a/extensions/ruby/package.json
+++ b/extensions/ruby/package.json
@@ -6,8 +6,8 @@
 	"contributes": {
 		"languages": [{
 			"id": "ruby",
-			"extensions": [ ".rb", ".rbx", ".rjs", ".gemspec", ".pp", ".rake" ],
-			"filenames": [ "rakefile", "gemfile" ],
+			"extensions": [ ".rb", ".rbx", ".rjs", ".gemspec", ".pp", ".rake", ".ru" ],
+			"filenames": [ "rakefile", "gemfile", "guardfile" ],
 			"aliases": [ "Ruby", "rb" ],
 			"configuration": "./ruby.configuration.json"
 		}],
@@ -17,4 +17,4 @@
 			"path": "./syntaxes/Ruby.plist"
 		}]
 	}
-}
\ No newline at end of file
+}