1 files changed, 3 insertions, 2 deletions
diff --git a/ext/extmk.rb.in b/ext/extmk.rb.in
index b1eab87a03..6efcf45986 100644
--- a/ext/extmk.rb.in
+++ b/ext/extmk.rb.in
@@ -351,9 +351,10 @@ def create_makefile(target)
 
   defflag = ''
   if RUBY_PLATFORM =~ /cygwin|mingw/ and not $static
-    if File.exist? target + ".def"
-      defflag = "--def=" + target + ".def"
+    open(target + '.def', 'wb') do |f|
+      f.print "EXPORTS\n", "Init_", target, "\n"
     end
+    defflag = "--def=" + target + ".def"
   end
 
   $srcdir = $top_srcdir + "/ext/" + $mdir