diff --git a/lib/jekyll/configuration.rb b/lib/jekyll/configuration.rb
index e4855a9d..ca5d4839 100644
--- a/lib/jekyll/configuration.rb
+++ b/lib/jekyll/configuration.rb
@@ -137,7 +137,7 @@ module Jekyll
       config_files = override.delete('config')
       if config_files.to_s.empty?
         default = %w[yml yaml].find(Proc.new { 'yml' }) do |ext|
-          File.exists? Jekyll.sanitized_path(source(override), "_config.#{ext}")
+          File.exist?(Jekyll.sanitized_path(source(override), "_config.#{ext}"))
         end
         config_files = Jekyll.sanitized_path(source(override), "_config.#{default}")
         @default_config_file = true
diff --git a/test/test_configuration.rb b/test/test_configuration.rb
index 7e14a418..8de8ac29 100644
--- a/test/test_configuration.rb
+++ b/test/test_configuration.rb
@@ -42,12 +42,12 @@ class TestConfiguration < JekyllUnitTest
       assert_equal [source_dir("_config.yml")], @config.config_files(@no_override)
     end
     should "return .yaml if it exists but .yml does not" do
-      mock(File).exists?(source_dir("_config.yml")) { false }
-      mock(File).exists?(source_dir("_config.yaml")) { true }
+      mock(File).exist?(source_dir("_config.yml")) { false }
+      mock(File).exist?(source_dir("_config.yaml")) { true }
       assert_equal [source_dir("_config.yaml")], @config.config_files(@no_override)
     end
     should "return .yml if both .yml and .yaml exist" do
-      mock(File).exists?(source_dir("_config.yml")) { true }
+      mock(File).exist?(source_dir("_config.yml")) { true }
       assert_equal [source_dir("_config.yml")], @config.config_files(@no_override)
     end
     should "return the config if given one config file" do
diff --git a/test/test_site.rb b/test/test_site.rb
index c460d873..76ce9ce1 100644
--- a/test/test_site.rb
+++ b/test/test_site.rb
@@ -143,7 +143,7 @@ class TestSite < JekyllUnitTest
 
       # simulate destination file deletion
       File.unlink dest
-      refute File.exists?(dest)
+      refute File.exist?(dest)
 
       sleep 1
       @site.process