diff --git a/lib/rubygems.rb b/lib/rubygems.rb
index 619ed385f7..d1d40429e7 100644
--- a/lib/rubygems.rb
+++ b/lib/rubygems.rb
@@ -983,7 +983,7 @@ An Array (#{env.inspect}) was passed in from #{caller[3]}
   def self.win_platform?
     if @@win_platform.nil?
       ruby_platform = RbConfig::CONFIG["host_os"]
-      @@win_platform = !!WIN_PATTERNS.find {|r| ruby_platform =~ r }
+      @@win_platform = !WIN_PATTERNS.find {|r| ruby_platform =~ r }.nil?
     end
 
     @@win_platform
diff --git a/lib/rubygems/dependency_installer.rb b/lib/rubygems/dependency_installer.rb
index 701a1ff61f..3c5ef763ff 100644
--- a/lib/rubygems/dependency_installer.rb
+++ b/lib/rubygems/dependency_installer.rb
@@ -65,7 +65,7 @@ class Gem::DependencyInstaller
   # :build_args:: See Gem::Installer::new
 
   def initialize(options = {})
-    @only_install_dir = !!options[:install_dir]
+    @only_install_dir = !options[:install_dir].nil?
     @install_dir = options[:install_dir] || Gem.dir
     @build_root = options[:build_root]
 
diff --git a/lib/rubygems/version.rb b/lib/rubygems/version.rb
index 307d429e74..3c2f6ad017 100644
--- a/lib/rubygems/version.rb
+++ b/lib/rubygems/version.rb
@@ -302,7 +302,7 @@ class Gem::Version
 
   def prerelease?
     unless instance_variable_defined? :@prerelease
-      @prerelease = !!(@version =~ /[a-zA-Z]/)
+      @prerelease = !(@version =~ /[a-zA-Z]/).nil?
     end
     @prerelease
   end