diff --git a/.cirrus.yml b/.cirrus.yml
index 24f152846d97f..929f87192b05a 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -29,7 +29,7 @@ task:
 task:
   name: nightly x86_64-unknown-freebsd-14
   freebsd_instance:
-    image: freebsd-14-0-current-amd64-v20230330
+    image: freebsd-14-0-current-amd64-v20230420
   setup_script:
     - pkg install -y libnghttp2 curl
     - curl https://sh.rustup.rs -sSf --output rustup.sh
diff --git a/libc-test/build.rs b/libc-test/build.rs
index 2b20745ee3e74..7e6f7efad1be6 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -2202,9 +2202,13 @@ fn test_freebsd(target: &str) {
 
             // Added in freebsd 14.
             "IFCAP_MEXTPG" if Some(14) > freebsd_ver => true,
+            // Added in freebsd 13 but replaced by IFF_NEEDSEPOCH.
+            "IFF_KNOWSEPOCH" => true,
+            // Added in freebsd 14.
+            "IFF_NEEDSEPOCH" if Some(14) > freebsd_ver => true,
             // Added in freebsd 13.
-            "IFF_KNOWSEPOCH" | "IFCAP_TXTLS4" | "IFCAP_TXTLS6" | "IFCAP_VXLAN_HWCSUM"
-            | "IFCAP_VXLAN_HWTSO" | "IFCAP_TXTLS_RTLMT" | "IFCAP_TXTLS"
+            "IFCAP_TXTLS4" | "IFCAP_TXTLS6" | "IFCAP_VXLAN_HWCSUM" | "IFCAP_VXLAN_HWTSO"
+            | "IFCAP_TXTLS_RTLMT" | "IFCAP_TXTLS"
                 if Some(13) > freebsd_ver =>
             {
                 true
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index c453e7c9b1c13..e140e32155add 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -3163,8 +3163,15 @@ pub const IFF_DEBUG: ::c_int = 0x4;
 pub const IFF_LOOPBACK: ::c_int = 0x8;
 /// (i) is a point-to-point link
 pub const IFF_POINTOPOINT: ::c_int = 0x10;
-/// (i) calls if_input in net epoch
-pub const IFF_KNOWSEPOCH: ::c_int = 0x20;
+cfg_if! {
+    if #[cfg(not(freebsd14))] {
+        /// (i) calls if_input in net epoch
+        pub const IFF_KNOWSEPOCH: ::c_int = 0x20;
+    } else {
+        /// (i) calls if_input in net epoch
+        pub const IFF_NEEDSEPOCH: ::c_int = 0x20;
+    }
+}
 /// (d) resources allocated
 pub const IFF_RUNNING: ::c_int = 0x40;
 #[doc(hidden)]