diff --git a/lib/mruby/build.rb b/lib/mruby/build.rb
index 55b82cd2b0..c080857a05 100644
--- a/lib/mruby/build.rb
+++ b/lib/mruby/build.rb
@@ -280,7 +280,7 @@ def cygwin_filename(name)
       if name.is_a?(Array)
         name.flatten.map { |n| cygwin_filename(n) }
       else
-        `cygpath -w "#{filename(name)}"`.strip
+        '"%s"' % `cygpath -w "#{filename(name)}"`.strip
       end
     end