diff --git a/ext/openssl/extconf.rb b/ext/openssl/extconf.rb
--- ext/openssl/extconf.rb
+++ ext/openssl/extconf.rb
@@ -45,8 +45,9 @@
   if $mswin || $mingw
     # required for static OpenSSL libraries
     have_library("gdi32") # OpenSSL <= 1.0.2 (for RAND_screen())
     have_library("crypt32")
+    have_library("advapi32")
   end
 
   return false unless have_header("openssl/ssl.h")