diff --git a/changelog/2000.changed.md b/changelog/2000.changed.md
index cbc235f801..39a0bcf738 100644
--- a/changelog/2000.changed.md
+++ b/changelog/2000.changed.md
@@ -1 +1 @@
-`mmap`, `mmap_anonymous`, `munmap`, `mremap` and `madvise` updated to use `NonNull`.
\ No newline at end of file
+`mmap`, `mmap_anonymous`, `munmap`, `mremap`, `madvise` and `msync` updated to use `NonNull`.
\ No newline at end of file
diff --git a/src/sys/mman.rs b/src/sys/mman.rs
index 841e7717db..714c4777ef 100644
--- a/src/sys/mman.rs
+++ b/src/sys/mman.rs
@@ -585,11 +585,11 @@ pub unsafe fn mprotect(
 ///
 /// [`msync(2)`]: https://man7.org/linux/man-pages/man2/msync.2.html
 pub unsafe fn msync(
-    addr: *mut c_void,
+    addr: NonNull<c_void>,
     length: size_t,
     flags: MsFlags,
 ) -> Result<()> {
-    Errno::result(libc::msync(addr, length, flags.bits())).map(drop)
+    Errno::result(libc::msync(addr.as_ptr(), length, flags.bits())).map(drop)
 }
 
 #[cfg(not(target_os = "android"))]