diff --git a/lib/rscons/builders/object.rb b/lib/rscons/builders/object.rb
index 9549311..05d02c0 100644
--- a/lib/rscons/builders/object.rb
+++ b/lib/rscons/builders/object.rb
@@ -46,8 +46,8 @@ module Rscons
       end
 
       def produces?(target, source, env)
-        target.has_suffix?(env['OBJSUFFIX']) and KNOWN_SUFFIXES.find do |compiler, suffix_var|
-          source.has_suffix?(env[suffix_var])
+        target.end_with?(*env['OBJSUFFIX']) and KNOWN_SUFFIXES.find do |compiler, suffix_var|
+          source.end_with?(*env[suffix_var])
         end
       end
 
@@ -58,7 +58,7 @@ module Rscons
           '_DEPFILE' => target.set_suffix('.mf'),
         })
         com_prefix = KNOWN_SUFFIXES.find do |compiler, suffix_var|
-          sources.first.has_suffix?(env[suffix_var])
+          sources.first.end_with?(*env[suffix_var])
         end.tap do |v|
           v.nil? and raise "Error: unknown input file type: #{sources.first.inspect}"
         end.first
diff --git a/lib/rscons/builders/program.rb b/lib/rscons/builders/program.rb
index 9ed50c3..f25924e 100644
--- a/lib/rscons/builders/program.rb
+++ b/lib/rscons/builders/program.rb
@@ -21,9 +21,9 @@ module Rscons
         return false unless objects
         ld = if env["LD"]
                env["LD"]
-             elsif sources.find {|s| s.has_suffix?(env["DSUFFIX"])}
+             elsif sources.find {|s| s.end_with?(*env["DSUFFIX"])}
                env["DC"]
-             elsif sources.find {|s| s.has_suffix?(env["CXXSUFFIX"])}
+             elsif sources.find {|s| s.end_with?(*env["CXXSUFFIX"])}
                env["CXX"]
              else
                env["CC"]
diff --git a/lib/rscons/environment.rb b/lib/rscons/environment.rb
index 16dfdb6..4cd475a 100644
--- a/lib/rscons/environment.rb
+++ b/lib/rscons/environment.rb
@@ -254,7 +254,7 @@ module Rscons
     # Return a list of the converted file names.
     def build_sources(sources, suffixes, cache, vars)
       sources.map do |source|
-        if source.has_suffix?(suffixes)
+        if source.end_with?(*suffixes)
           source
         else
           converted = nil
diff --git a/lib/rscons/monkey/string.rb b/lib/rscons/monkey/string.rb
index bb70541..d4f07f9 100644
--- a/lib/rscons/monkey/string.rb
+++ b/lib/rscons/monkey/string.rb
@@ -1,16 +1,5 @@
 # Standard Ruby String class.
 class String
-  # Check if the given string ends with any of the supplied suffixes
-  # @param suffix [String, Array] The suffix to look for.
-  # @return a true value if the string ends with one of the suffixes given.
-  def has_suffix?(suffix)
-    if suffix
-      suffix = [suffix] if suffix.is_a?(String)
-      suffix = suffix.flatten
-      suffix.find {|s| self.end_with?(s)}
-    end
-  end
-
   # Return a new string with the suffix (dot character and extension) changed
   # to the given suffix.
   # @param suffix [String] The new suffix.