diff --git a/src/unix/freebsd.c b/src/unix/freebsd.c
index 406eb158..fe795a0e 100644
--- a/src/unix/freebsd.c
+++ b/src/unix/freebsd.c
@@ -264,25 +264,18 @@ int uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count) {
 }
 
 
-int uv__sendmmsg(int fd,
-                 struct uv__mmsghdr* mmsg,
-                 unsigned int vlen,
-                 unsigned int flags) {
+int uv__sendmmsg(int fd, struct uv__mmsghdr* mmsg, unsigned int vlen) {
 #if __FreeBSD__ >= 11
-  return sendmmsg(fd, mmsg, vlen, flags);
+  return sendmmsg(fd, mmsg, vlen, /* flags */ 0);
 #else
   return errno = ENOSYS, -1;
 #endif
 }
 
 
-int uv__recvmmsg(int fd,
-                 struct uv__mmsghdr* mmsg,
-                 unsigned int vlen,
-                 unsigned int flags,
-                 struct timespec* timeout) {
+int uv__recvmmsg(int fd, struct uv__mmsghdr* mmsg, unsigned int vlen) {
 #if __FreeBSD__ >= 11
-  return recvmmsg(fd, mmsg, vlen, flags, timeout);
+  return recvmmsg(fd, mmsg, vlen, 0 /* flags */, NULL /* timeout */);
 #else
   return errno = ENOSYS, -1;
 #endif
diff --git a/src/unix/internal.h b/src/unix/internal.h
index 9d3c2297..570274ed 100644
--- a/src/unix/internal.h
+++ b/src/unix/internal.h
@@ -334,15 +334,8 @@ struct uv__mmsghdr {
   unsigned int msg_len;
 };
 
-int uv__recvmmsg(int fd,
-                 struct uv__mmsghdr* mmsg,
-                 unsigned int vlen,
-                 unsigned int flags,
-                 struct timespec* timeout);
-int uv__sendmmsg(int fd,
-                 struct uv__mmsghdr* mmsg,
-                 unsigned int vlen,
-                 unsigned int flags);
+int uv__recvmmsg(int fd, struct uv__mmsghdr* mmsg, unsigned int vlen);
+int uv__sendmmsg(int fd, struct uv__mmsghdr* mmsg, unsigned int vlen);
 #else
 #define HAVE_MMSG 0
 #endif
diff --git a/src/unix/linux-syscalls.c b/src/unix/linux-syscalls.c
index 160056b4..44daaf12 100644
--- a/src/unix/linux-syscalls.c
+++ b/src/unix/linux-syscalls.c
@@ -37,8 +37,6 @@
 #ifndef __NR_recvmmsg
 # if defined(__x86_64__)
 #  define __NR_recvmmsg 299
-# elif defined(__i386__)
-#  define __NR_recvmmsg 337
 # elif defined(__arm__)
 #  define __NR_recvmmsg (UV_SYSCALL_BASE + 365)
 # endif
@@ -47,8 +45,6 @@
 #ifndef __NR_sendmmsg
 # if defined(__x86_64__)
 #  define __NR_sendmmsg 307
-# elif defined(__i386__)
-#  define __NR_sendmmsg 345
 # elif defined(__arm__)
 #  define __NR_sendmmsg (UV_SYSCALL_BASE + 374)
 # endif
@@ -146,25 +142,51 @@
 
 struct uv__mmsghdr;
 
-int uv__sendmmsg(int fd,
-                 struct uv__mmsghdr* mmsg,
-                 unsigned int vlen,
-                 unsigned int flags) {
-#if defined(__NR_sendmmsg)
-  return syscall(__NR_sendmmsg, fd, mmsg, vlen, flags);
+int uv__sendmmsg(int fd, struct uv__mmsghdr* mmsg, unsigned int vlen) {
+#if defined(__i386__)
+  unsigned long args[4];
+  int rc;
+
+  args[0] = (unsigned long) fd;
+  args[1] = (unsigned long) mmsg;
+  args[2] = (unsigned long) vlen;
+  args[3] = /* flags */ 0;
+
+  /* socketcall() raises EINVAL when SYS_SENDMMSG is not supported. */
+  rc = syscall(/* __NR_socketcall */ 102, 20 /* SYS_SENDMMSG */, args);
+  if (rc == -1)
+    if (errno == EINVAL)
+      errno = ENOSYS;
+
+  return rc;
+#elif defined(__NR_sendmmsg)
+  return syscall(__NR_sendmmsg, fd, mmsg, vlen, /* flags */ 0);
 #else
   return errno = ENOSYS, -1;
 #endif
 }
 
 
-int uv__recvmmsg(int fd,
-                 struct uv__mmsghdr* mmsg,
-                 unsigned int vlen,
-                 unsigned int flags,
-                 struct timespec* timeout) {
-#if defined(__NR_recvmmsg)
-  return syscall(__NR_recvmmsg, fd, mmsg, vlen, flags, timeout);
+int uv__recvmmsg(int fd, struct uv__mmsghdr* mmsg, unsigned int vlen) {
+#if defined(__i386__)
+  unsigned long args[5];
+  int rc;
+
+  args[0] = (unsigned long) fd;
+  args[1] = (unsigned long) mmsg;
+  args[2] = (unsigned long) vlen;
+  args[3] = /* flags */ 0;
+  args[4] = /* timeout */ 0;
+
+  /* socketcall() raises EINVAL when SYS_RECVMMSG is not supported. */
+  rc = syscall(/* __NR_socketcall */ 102, 19 /* SYS_RECVMMSG */, args);
+  if (rc == -1)
+    if (errno == EINVAL)
+      errno = ENOSYS;
+
+  return rc;
+#elif defined(__NR_recvmmsg)
+  return syscall(__NR_recvmmsg, fd, mmsg, vlen, /* flags */ 0, /* timeout */ 0);
 #else
   return errno = ENOSYS, -1;
 #endif
diff --git a/src/unix/udp.c b/src/unix/udp.c
index 5ca54cef..a3ef558a 100644
--- a/src/unix/udp.c
+++ b/src/unix/udp.c
@@ -73,12 +73,12 @@ static void uv__udp_mmsg_init(void) {
   s = uv__socket(AF_INET, SOCK_DGRAM, 0);
   if (s < 0)
     return;
-  ret = uv__sendmmsg(s, NULL, 0, 0);
+  ret = uv__sendmmsg(s, NULL, 0);
   if (ret == 0 || errno != ENOSYS) {
     uv__sendmmsg_avail = 1;
     uv__recvmmsg_avail = 1;
   } else {
-    ret = uv__recvmmsg(s, NULL, 0, 0, NULL);
+    ret = uv__recvmmsg(s, NULL, 0);
     if (ret == 0 || errno != ENOSYS)
       uv__recvmmsg_avail = 1;
   }
@@ -213,7 +213,7 @@ static int uv__udp_recvmmsg(uv_udp_t* handle, uv_buf_t* buf) {
   }
 
   do
-    nread = uv__recvmmsg(handle->io_watcher.fd, msgs, chunks, 0, NULL);
+    nread = uv__recvmmsg(handle->io_watcher.fd, msgs, chunks);
   while (nread == -1 && errno == EINTR);
 
   if (nread < 1) {
@@ -356,7 +356,7 @@ write_queue_drain:
   }
 
   do
-    npkts = uv__sendmmsg(handle->io_watcher.fd, h, pkts, 0);
+    npkts = uv__sendmmsg(handle->io_watcher.fd, h, pkts);
   while (npkts == -1 && errno == EINTR);
 
   if (npkts < 1) {