diff --git a/lib/rubygems/commands/install_command.rb b/lib/rubygems/commands/install_command.rb
index d2dd7ac92090..56ff8fc56407 100644
--- a/lib/rubygems/commands/install_command.rb
+++ b/lib/rubygems/commands/install_command.rb
@@ -200,25 +200,31 @@ def install_gem name, version # :nodoc:
 
     req = Gem::Requirement.create(version)
 
-    inst = Gem::DependencyInstaller.new options
+    if options[:ignore_dependencies]
+      inst = Gem::Installer.new name, options
+      inst.install
+      @installed_specs.push(inst.spec)
+    else
+      inst = Gem::DependencyInstaller.new options
 
-    if options[:explain]
-      request_set = inst.resolve_dependencies name, req
+      if options[:explain]
+        request_set = inst.resolve_dependencies name, req
 
-      puts "Gems to install:"
+        puts "Gems to install:"
 
-      request_set.specs.map { |s| s.full_name }.sort.each do |s|
-        puts "  #{s}"
-      end
+        request_set.specs.map { |s| s.full_name }.sort.each do |s|
+          puts "  #{s}"
+        end
 
-      return
-    else
-      inst.install name, req
-    end
+        return
+      else
+        inst.install name, req
+      end
 
-    @installed_specs.push(*inst.installed_gems)
+      @installed_specs.push(*inst.installed_gems)
 
-    show_install_errors inst.errors
+      show_install_errors inst.errors
+    end
   end
 
   def install_gems # :nodoc: