diff --git a/libc-test/build.rs b/libc-test/build.rs
index d00e8bf2aec88..60c1c6630a846 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -2063,6 +2063,11 @@ fn test_freebsd(target: &str) {
 
             "VM_TOTAL" if Some(11) == freebsd_ver => true,
 
+            // Added in FreeBSD 14.
+            "KERN_STACKTOP" if Some(14) > freebsd_ver => true,
+            // Added in FreeBSD 12.
+            "KERN_MAXPHYS" if Some(12) > freebsd_ver => true,
+
             _ => false,
         }
     });