diff --git a/libc-test/build.rs b/libc-test/build.rs
index 26f746b01f154..a6137f4a506e2 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -2105,6 +2105,19 @@ fn test_freebsd(target: &str) {
             | "MFD_CLOEXEC"
             | "MFD_ALLOW_SEALING"
             | "MFD_HUGETLB"
+            | "MFD_HUGE_MASK"
+            | "MFD_HUGE_64KB"
+            | "MFD_HUGE_512KB"
+            | "MFD_HUGE_1MB"
+            | "MFD_HUGE_2MB"
+            | "MFD_HUGE_8MB"
+            | "MFD_HUGE_16MB"
+            | "MFD_HUGE_32MB"
+            | "MFD_HUGE_256MB"
+            | "MFD_HUGE_512MB"
+            | "MFD_HUGE_1GB"
+            | "MFD_HUGE_2GB"
+            | "MFD_HUGE_16GB"
                 if Some(13) > freebsd_ver =>
             {
                 true
diff --git a/libc-test/semver/freebsd.txt b/libc-test/semver/freebsd.txt
index f1ce1b571ae93..491c57917008d 100644
--- a/libc-test/semver/freebsd.txt
+++ b/libc-test/semver/freebsd.txt
@@ -699,6 +699,22 @@ MAXTC
 MCL_CURRENT
 MCL_FUTURE
 MDMBUF
+MFD_ALLOW_SEALING
+MFD_CLOEXEC
+MFD_HUGE_16GB
+MFD_HUGE_16MB
+MFD_HUGE_1GB
+MFD_HUGE_1MB
+MFD_HUGE_256MB
+MFD_HUGE_2GB
+MFD_HUGE_2MB
+MFD_HUGE_32MB
+MFD_HUGE_512KB
+MFD_HUGE_512MB
+MFD_HUGE_64KB
+MFD_HUGE_8MB
+MFD_HUGE_MASK
+MFD_HUGETLB
 MINCORE_INCORE
 MINCORE_MODIFIED
 MINCORE_MODIFIED_OTHER
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index a44af09eb6e97..43686d3f51fae 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -3657,6 +3657,19 @@ pub const CPUCLOCK_WHICH_TID: ::c_int = 1;
 pub const MFD_CLOEXEC: ::c_uint = 0x00000001;
 pub const MFD_ALLOW_SEALING: ::c_uint = 0x00000002;
 pub const MFD_HUGETLB: ::c_uint = 0x00000004;
+pub const MFD_HUGE_MASK: ::c_uint = 0xFC000000;
+pub const MFD_HUGE_64KB: ::c_uint = 16 << 26;
+pub const MFD_HUGE_512KB: ::c_uint = 19 << 26;
+pub const MFD_HUGE_1MB: ::c_uint = 20 << 26;
+pub const MFD_HUGE_2MB: ::c_uint = 21 << 26;
+pub const MFD_HUGE_8MB: ::c_uint = 23 << 26;
+pub const MFD_HUGE_16MB: ::c_uint = 24 << 26;
+pub const MFD_HUGE_32MB: ::c_uint = 25 << 26;
+pub const MFD_HUGE_256MB: ::c_uint = 28 << 26;
+pub const MFD_HUGE_512MB: ::c_uint = 29 << 26;
+pub const MFD_HUGE_1GB: ::c_uint = 30 << 26;
+pub const MFD_HUGE_2GB: ::c_uint = 31 << 26;
+pub const MFD_HUGE_16GB: ::c_uint = 34 << 26;
 
 pub const SHM_LARGEPAGE_ALLOC_DEFAULT: ::c_int = 0;
 pub const SHM_LARGEPAGE_ALLOC_NOWAIT: ::c_int = 1;