diff --git a/README b/README
index 7199166669..0062563d5c 100644
--- a/README
+++ b/README
@@ -74,7 +74,7 @@ REQUIREMENTS:
                      ≥ 6.10 for fcntl(F_DUPFD_QUERY), unprivileged linkat(AT_EMPTY_PATH),
                             and block device 'partscan' sysfs attribute
                      ≥ 6.13 for PIDFD_GET_INFO and {set,remove}xattrat()
-                     ≥ 6.16 for coredump pattern '%F' (pidfd) specifier
+                     ≥ 6.16 for coredump pattern '%F' (pidfd) specifier and SO_PASSRIGHTS
 
         ✅ systemd utilizes several new kernel APIs, but will fall back gracefully
            when unavailable.
diff --git a/src/basic/missing_socket.h b/src/basic/missing_socket.h
index 3a81dfff8a..cc453d2396 100644
--- a/src/basic/missing_socket.h
+++ b/src/basic/missing_socket.h
@@ -13,6 +13,11 @@
 #define SO_PEERPIDFD 77
 #endif
 
+/* Supported since kernel v6.16 (77cbe1a6d8730a07f99f9263c2d5f2304cf5e830) */
+#ifndef SO_PASSRIGHTS
+#define SO_PASSRIGHTS 83
+#endif
+
 /* Not exposed yet. Defined in include/linux/socket.h. */
 #ifndef SOL_SCTP
 #define SOL_SCTP 132