diff --git a/libc-test/build.rs b/libc-test/build.rs
index 938294717eee3..743f9f28404db 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -2306,6 +2306,10 @@ fn test_freebsd(target: &str) {
             | "PWAIT" | "PLOCK" | "PPAUSE" | "PRI_MIN_TIMESHARE" | "PUSER" | "PI_AV" | "PI_NET"
             | "PI_DISK" | "PI_TTY" | "PI_DULL" | "PI_SOFT" => true,
 
+            // This constant changed in FreeBSD 15 (git 3458bbd397783).  It was never intended to
+            // be stable, and probably shouldn't be bound by libc at all.
+            "RLIM_NLIMITS" => true,
+
             // This symbol changed in FreeBSD 14 (git 051e7d78b03), but the new
             // version should be safe to use on older releases.
             "IFCAP_CANTCHANGE" => true,
@@ -2436,7 +2440,6 @@ fn test_freebsd(target: &str) {
 
             // Flags introduced in FreeBSD 14.
             "TCP_MAXUNACKTIME"
-            | "TCP_MAXPEAKRATE"
             | "TCP_IDLE_REDUCE"
             | "TCP_REMOTE_UDP_ENCAPS_PORT"
             | "TCP_DELACK"
diff --git a/libc-test/semver/freebsd.txt b/libc-test/semver/freebsd.txt
index 933fea0e63e94..70484bbbb9579 100644
--- a/libc-test/semver/freebsd.txt
+++ b/libc-test/semver/freebsd.txt
@@ -1494,7 +1494,6 @@ TCP_KEEPIDLE
 TCP_KEEPINIT
 TCP_KEEPINTVL
 TCP_LOG_LIMIT
-TCP_MAXPEAKRATE
 TCP_MAXSEG
 TCP_MAXUNACKTIME
 TCP_MD5SIG
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 3cf1fc1aeeef3..e7239fd965e07 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -3779,7 +3779,6 @@ pub const TCP_INFO: ::c_int = 32;
 pub const TCP_CONGESTION: ::c_int = 64;
 pub const TCP_CCALGOOPT: ::c_int = 65;
 pub const TCP_MAXUNACKTIME: ::c_int = 68;
-pub const TCP_MAXPEAKRATE: ::c_int = 69;
 pub const TCP_IDLE_REDUCE: ::c_int = 70;
 pub const TCP_REMOTE_UDP_ENCAPS_PORT: ::c_int = 71;
 pub const TCP_DELACK: ::c_int = 72;