requirements/x11_requirement: fix Rubocop warnings.

1 files changed, 2 insertions, 2 deletions

diff --git a/Library/Homebrew/requirements/x11_requirement.rb b/Library/Homebrew/requirements/x11_requirement.rb
index d91f9d3d4..6a320401a 100644
--- a/Library/Homebrew/requirements/x11_requirement.rb
+++ b/Library/Homebrew/requirements/x11_requirement.rb
@@ -12,7 +12,7 @@ class X11Requirement < Requirement
 
   def initialize(name = "x11", tags = [])
     @name = name
-    if /(\d\.)+\d/ === tags.first
+    if /(\d\.)+\d/ =~ tags.first
       @min_version = Version.create(tags.shift)
       @min_version_string = " #{@min_version}"
     else
@@ -33,7 +33,7 @@ class X11Requirement < Requirement
   end
 
   def <=>(other)
-    return unless X11Requirement === other
+    return unless other.is_a? X11Requirement
     min_version <=> other.min_version
   end