diff --git a/libc-test/semver/linux-gnu.txt b/libc-test/semver/linux-gnu.txt
index e3cfbbbb710d..9001de4c4ff3 100644
--- a/libc-test/semver/linux-gnu.txt
+++ b/libc-test/semver/linux-gnu.txt
@@ -626,6 +626,7 @@ malloc_stats
 malloc_trim
 malloc_usable_size
 mallopt
+mempcpy
 mq_notify
 nl_mmap_hdr
 nl_mmap_req
diff --git a/libc-test/semver/unix.txt b/libc-test/semver/unix.txt
index 093dde173137..052c24178dfc 100644
--- a/libc-test/semver/unix.txt
+++ b/libc-test/semver/unix.txt
@@ -638,6 +638,7 @@ localtime_r
 lseek
 lstat
 malloc
+memccpy
 memchr
 memcmp
 memcpy
diff --git a/src/unix/linux_like/linux/gnu/mod.rs b/src/unix/linux_like/linux/gnu/mod.rs
index 14e5dd5d1dd6..4f6da0a6b7dc 100644
--- a/src/unix/linux_like/linux/gnu/mod.rs
+++ b/src/unix/linux_like/linux/gnu/mod.rs
@@ -1431,6 +1431,8 @@ extern "C" {
         timeout: *const crate::timespec,
         sigmask: *const crate::sigset_t,
     ) -> c_int;
+
+    pub fn mempcpy(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
 }
 
 cfg_if! {
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 0ab7ae0fd19a..9154a0c43cfb 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -681,6 +681,7 @@ extern "C" {
     pub fn memcpy(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
     pub fn memmove(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
     pub fn memset(dest: *mut c_void, c: c_int, n: size_t) -> *mut c_void;
+    pub fn memccpy(dest: *mut c_void, src: *const c_void, c: c_int, n: size_t) -> *mut c_void;
 }
 
 extern "C" {