diff --git a/src/library.js b/src/library.js
index 2e0f3afb02e2e..c8205d2b5a555 100644
--- a/src/library.js
+++ b/src/library.js
@@ -6568,6 +6568,7 @@ LibraryManager.library = {
     ENOTSUP: 95,
     ENOTTY: 25,
     ENXIO: 6,
+    EOPNOTSUPP: 45,
     EOVERFLOW: 75,
     EOWNERDEAD: 130,
     EPERM: 1,
@@ -6649,6 +6650,7 @@ LibraryManager.library = {
     95: 'Operation not supported',
     25: 'Inappropriate ioctl for device',
     6: 'No such device or address',
+    45: 'Op not supported on transport endpoint',
     75: 'Value too large for defined data type',
     130: 'Owner died',
     1: 'Operation not permitted',
@@ -7393,6 +7395,14 @@ LibraryManager.library = {
     }
   },
 
+  socketpair__deps: ['__setErrNo', '$ERRNO_CODES'],
+  socketpair: function(domain, type, protocol, sv) {
+    // int socketpair(int domain, int type, int protocol, int sv[2]);
+    // http://pubs.opengroup.org/onlinepubs/009695399/functions/socketpair.html
+    ___setErrNo(ERRNO_CODES.EOPNOTSUPP);
+    return -1;
+  },
+
   // pty.h
 
   openpty: function() { throw 'openpty: TODO' },
diff --git a/system/include/sys/socket.h b/system/include/sys/socket.h
index 8ca6eccf8380b..56a37375247e2 100644
--- a/system/include/sys/socket.h
+++ b/system/include/sys/socket.h
@@ -68,6 +68,7 @@ ssize_t recv(int s, void *buf, size_t len, int flags);
 ssize_t send(int s, const void *buf, size_t len, int flags);
 int setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen);
 ssize_t sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen);
+int socketpair(int domain, int type, int protocol, int sv[2]);
 
 struct msghdr
 {