diff --git a/libc-test/build.rs b/libc-test/build.rs
index 1685d22bd0f2..4baaf684e184 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -343,6 +343,11 @@ fn main() {
             "setrlimit" | "setrlimit64" |    // non-int in 1st arg
             "strerror_r" if linux => true,   // actually xpg-something-or-other
 
+            // int vs uint. Sorry musl, your prototype declarations are "correct" in the sense that
+            // they match the interface defined by Linux verbatim, but they conflict with other
+            // send*/recv* syscalls
+            "sendmmsg" | "recvmmsg" if musl => true,
+
             // typed 2nd arg on linux and android
             "gettimeofday" if linux || android || freebsd || openbsd || dragonfly => true,
 
diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index 81693382cdb5..3dd0a38c3162 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -181,6 +181,11 @@ s! {
         #[cfg(target_pointer_width = "64")]
         bits: [u64; 16],
     }
+
+    pub struct mmsghdr {
+        pub msg_hdr: ::msghdr,
+        pub msg_len: ::c_uint,
+    }
 }
 
 pub const ABDAY_1: ::nl_item = 0x20000;
@@ -617,6 +622,13 @@ extern {
     pub fn nl_langinfo_l(item: ::nl_item, locale: ::locale_t) -> *mut ::c_char;
 }
 
+extern {
+    pub fn sendmmsg(sockfd: ::c_int, msgvec: *mut mmsghdr, vlen: ::c_uint,
+                    flags: ::c_int) -> ::c_int;
+    pub fn recvmmsg(sockfd: ::c_int, msgvec: *mut mmsghdr, vlen: ::c_uint,
+                    flags: ::c_int, timeout: *mut ::timespec) -> ::c_int;
+}
+
 cfg_if! {
     if #[cfg(any(target_env = "musl",
                  target_env = "musleabi",