diff --git a/src/ChibiRuby.Compiler/Rakefile b/src/ChibiRuby.Compiler/Rakefile
index 21e4aa5e..f51aa774 100644
--- a/src/ChibiRuby.Compiler/Rakefile
+++ b/src/ChibiRuby.Compiler/Rakefile
@@ -12,6 +12,7 @@ task :build, ['target'] do |t, args|
   build_config_path = File.expand_path("../build_config.#{args.target}.rb", __FILE__)
   
   Dir.chdir(MRUBY_ROOT) do
-    sh "MRUBY_CONFIG=#{build_config_path} rake"
+    ENV['MRUBY_CONFIG'] = build_config_path
+    sh "rake"
   end
 end
diff --git a/src/ChibiRuby.Compiler/mrbgems/chibiruby-compiler/mrbgem.rake b/src/ChibiRuby.Compiler/mrbgems/chibiruby-compiler/mrbgem.rake
index 2a3567a1..86675560 100644
--- a/src/ChibiRuby.Compiler/mrbgems/chibiruby-compiler/mrbgem.rake
+++ b/src/ChibiRuby.Compiler/mrbgems/chibiruby-compiler/mrbgem.rake
@@ -34,6 +34,7 @@ MRuby.each_target do
     
     if is_vc
       flags << '/DLL'
+      flags << "/IMPLIB:#{build_dir}/lib/libmruby_import.lib"
       flags << "/DEF:#{deffile}"
       flags << libmruby_static
     else