diff --git a/libc-test/build.rs b/libc-test/build.rs
index 9f4ccc59457b3..f2634e94fc869 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -2041,7 +2041,7 @@ fn test_freebsd(target: &str) {
             // This was changed to 96(0x60) in FreeBSD 13:
             // https://github.com/freebsd/freebsd/
             // commit/06b00ceaa914a3907e4e27bad924f44612bae1d7
-            "MINCORE_SUPER" if Some(13) == freebsd_ver => true,
+            "MINCORE_SUPER" if Some(13) <= freebsd_ver => true,
 
             // Added in FreeBSD 12.0
             "EINTEGRITY" if Some(11) == freebsd_ver => true,
@@ -2089,6 +2089,9 @@ fn test_freebsd(target: &str) {
             // Added in in FreeBSD 13.0 (r367776 and r367287)
             "SCM_CREDS2" | "LOCAL_CREDS_PERSISTENT" if Some(13) > freebsd_ver => true,
 
+            // Added in FreeBSD 14
+            "SPACECTL_DEALLOC" if Some(14) > freebsd_ver => true,
+
             "VM_TOTAL" if Some(11) == freebsd_ver => true,
 
             // Added in FreeBSD 13.
@@ -2193,6 +2196,9 @@ fn test_freebsd(target: &str) {
             // `ptrace_sc_ret` is not available in FreeBSD 11
             "ptrace_sc_ret" if Some(11) == freebsd_ver => true,
 
+            // `spacectl_range` was introduced in FreeBSD 14
+            "spacectl_range" if Some(14) > freebsd_ver => true,
+
             // obsolete version
             "vmtotal" if Some(11) == freebsd_ver => true,
 
@@ -2221,6 +2227,9 @@ fn test_freebsd(target: &str) {
             // `ssize_t` in FreeBSD11:
             "aio_waitcomplete" if Some(10) == freebsd_ver => true,
 
+            // `fspacectl` was introduced in FreeBSD 14
+            "fspacectl" if Some(14) > freebsd_ver => true,
+
             // The `uname` function in the `utsname.h` FreeBSD header is a C
             // inline function (has no symbol) that calls the `__xuname` symbol.
             // Therefore the function pointer comparison does not make sense for it.
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 6c0fb3672bb0f..d4e28702cc2af 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -600,6 +600,11 @@ s! {
         pub mode: u16,
     }
 
+    pub struct spacectl_range {
+        pub r_offset: ::off_t,
+        pub r_len: ::off_t
+    }
+
     pub struct rusage_ext {
         pub rux_runtime: u64,
         pub rux_uticks: u64,
@@ -2978,6 +2983,9 @@ pub const F_SEAL_SEAL: ::c_int = 1;
 pub const F_SEAL_SHRINK: ::c_int = 2;
 pub const F_SEAL_WRITE: ::c_int = 8;
 
+// for use with fspacectl
+pub const SPACECTL_DEALLOC: ::c_int = 1;
+
 // For getrandom()
 pub const GRND_NONBLOCK: ::c_uint = 0x1;
 pub const GRND_RANDOM: ::c_uint = 0x2;
@@ -3805,6 +3813,14 @@ extern "C" {
         nbytes: ::size_t,
     ) -> ::ssize_t;
 
+    pub fn fspacectl(
+        fd: ::c_int,
+        cmd: ::c_int,
+        rqsr: *const spacectl_range,
+        flags: ::c_int,
+        rmsr: *mut spacectl_range,
+    ) -> ::c_int;
+
     pub fn jail(jail: *mut ::jail) -> ::c_int;
     pub fn jail_attach(jid: ::c_int) -> ::c_int;
     pub fn jail_remove(jid: ::c_int) -> ::c_int;