diff --git a/node.gyp b/node.gyp
index 95dd06a428c4fb..70dc80c4035f0f 100644
--- a/node.gyp
+++ b/node.gyp
@@ -558,7 +558,8 @@
             'mkssldef_flags': [
               # Categories to export.
               '-CAES,BF,BIO,DES,DH,DSA,EC,ECDH,ECDSA,ENGINE,EVP,HMAC,MD4,MD5,'
-              'NEXTPROTONEG,PSK,RC2,RC4,RSA,SHA,SHA0,SHA1,SHA256,SHA512,TLSEXT',
+              'NEXTPROTONEG,PSK,RC2,RC4,RSA,SHA,SHA0,SHA1,SHA256,SHA512,SOCK,'
+              'STDIO,TLSEXT',
               # Defines.
               '-DWIN32',
               # Symbols to filter from the export list.