diff --git a/libc-test/build.rs b/libc-test/build.rs
index fcd6ad613771a..c9f3211063054 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -2196,6 +2196,9 @@ fn test_freebsd(target: &str) {
             // `ptrace_coredump` introduced in FreeBSD 14.
             "ptrace_coredump" if Some(14) > freebsd_ver => true,
 
+            // `sockcred2` is not available in FreeBSD 12.
+            "sockcred2" if Some(13) > freebsd_ver => true,
+
             _ => false,
         }
     });
@@ -2233,6 +2236,9 @@ fn test_freebsd(target: &str) {
                 true
             }
 
+            // This is not available in FreeBSD 12.
+            "SOCKCRED2SIZE" if Some(13) > freebsd_ver => true,
+
             _ => false,
         }
     });
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs
index ee8be8401a272..cc92b17501030 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd13/mod.rs
@@ -30,17 +30,6 @@ s! {
         pub ext: [u64; 4],
     }
 
-    pub struct sockcred2 {
-        pub sc_version: ::c_int,
-        pub sc_pid: ::pid_t,
-        pub sc_uid: ::uid_t,
-        pub sc_euid: ::uid_t,
-        pub sc_gid: ::gid_t,
-        pub sc_egid: ::gid_t,
-        pub sc_ngroups: ::c_int,
-        pub sc_groups: [::gid_t; 1],
-    }
-
     pub struct kvm_page {
         pub kp_version: ::u_int,
         pub kp_paddr: ::kpaddr_t,
@@ -479,17 +468,6 @@ pub const DOMAINSET_POLICY_INTERLEAVE: ::c_int = 4;
 
 pub const MINCORE_SUPER: ::c_int = 0x20;
 
-f! {
-    pub fn SOCKCRED2SIZE(ngrps: usize) -> usize {
-        let ngrps = if ngrps > 0 {
-            ngrps - 1
-        } else {
-            0
-        };
-        ::mem::size_of::<sockcred2>() + ::mem::size_of::<::gid_t>() * ngrps
-    }
-}
-
 extern "C" {
     pub fn aio_readv(aiocbp: *mut ::aiocb) -> ::c_int;
     pub fn aio_writev(aiocbp: *mut ::aiocb) -> ::c_int;
diff --git a/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs b/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs
index 56269f7e8e3a7..56b6412b46d45 100644
--- a/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/freebsd14/mod.rs
@@ -30,17 +30,6 @@ s! {
         pub ext: [u64; 4],
     }
 
-    pub struct sockcred2 {
-        pub sc_version: ::c_int,
-        pub sc_pid: ::pid_t,
-        pub sc_uid: ::uid_t,
-        pub sc_euid: ::uid_t,
-        pub sc_gid: ::gid_t,
-        pub sc_egid: ::gid_t,
-        pub sc_ngroups: ::c_int,
-        pub sc_groups: [::gid_t; 1],
-    }
-
     pub struct kvm_page {
         pub kp_version: ::u_int,
         pub kp_paddr: ::kpaddr_t,
@@ -479,17 +468,6 @@ pub const DOMAINSET_POLICY_INTERLEAVE: ::c_int = 4;
 
 pub const MINCORE_SUPER: ::c_int = 0x60;
 
-f! {
-    pub fn SOCKCRED2SIZE(ngrps: usize) -> usize {
-        let ngrps = if ngrps > 0 {
-            ngrps - 1
-        } else {
-            0
-        };
-        ::mem::size_of::<sockcred2>() + ::mem::size_of::<::gid_t>() * ngrps
-    }
-}
-
 extern "C" {
     pub fn aio_readv(aiocbp: *mut ::aiocb) -> ::c_int;
     pub fn aio_writev(aiocbp: *mut ::aiocb) -> ::c_int;
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index f87a5cf0d96c1..5ac41cf25c46f 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -945,6 +945,17 @@ s! {
         pub generation: ::c_long,
         pub numdevs: ::c_int,
     }
+
+    pub struct sockcred2 {
+        pub sc_version: ::c_int,
+        pub sc_pid: ::pid_t,
+        pub sc_uid: ::uid_t,
+        pub sc_euid: ::uid_t,
+        pub sc_gid: ::gid_t,
+        pub sc_egid: ::gid_t,
+        pub sc_ngroups: ::c_int,
+        pub sc_groups: [::gid_t; 1],
+    }
 }
 
 s_no_extra_traits! {
@@ -3701,6 +3712,15 @@ f! {
         let (idx, offset) = (cpu / bitset_bits, cpu % bitset_bits);
         0 != cpuset.__bits[idx] & (1 << offset)
     }
+
+    pub fn SOCKCRED2SIZE(ngrps: usize) -> usize {
+        let ngrps = if ngrps > 0 {
+            ngrps - 1
+        } else {
+            0
+        };
+        ::mem::size_of::<sockcred2>() + ::mem::size_of::<::gid_t>() * ngrps
+    }
 }
 
 safe_f! {