diff --git a/libc-test/semver/netbsd.txt b/libc-test/semver/netbsd.txt
index 838f28f71b5d1..65f234b0dc092 100644
--- a/libc-test/semver/netbsd.txt
+++ b/libc-test/semver/netbsd.txt
@@ -1567,6 +1567,7 @@ sync
 syscall
 sysctl
 sysctlbyname
+sysctlnametomib
 sysctldesc
 tcp_info
 telldir
diff --git a/src/unix/bsd/netbsdlike/netbsd/mod.rs b/src/unix/bsd/netbsdlike/netbsd/mod.rs
index f919b73e5c2f4..2b5e9c9bfda35 100644
--- a/src/unix/bsd/netbsdlike/netbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/netbsd/mod.rs
@@ -2646,6 +2646,11 @@ extern "C" {
         newp: *const ::c_void,
         newlen: ::size_t,
     ) -> ::c_int;
+    pub fn sysctlnametomib(
+       name: *const ::c_char,
+       mibp: *mut ::c_int,
+       sizep: *mut ::size_t,
+    ) -> ::c_int;
     #[link_name = "__kevent50"]
     pub fn kevent(
         kq: ::c_int,