diff --git a/libc/include/sys/linux-syscalls.h b/libc/include/sys/linux-syscalls.h
index ec48ada..738d9e8 100644
--- a/libc/include/sys/linux-syscalls.h
+++ b/libc/include/sys/linux-syscalls.h
@@ -173,6 +173,7 @@
 #define __NR_rt_sigaction                 (__NR_SYSCALL_BASE + 174)
 #define __NR_rt_sigprocmask               (__NR_SYSCALL_BASE + 175)
 #define __NR_rt_sigtimedwait              (__NR_SYSCALL_BASE + 177)
+#define __NR_signalfd4                    (__NR_SYSCALL_BASE + 355)
 #define __NR_socket                       (__NR_SYSCALL_BASE + 281)
 #define __NR_socketpair                   (__NR_SYSCALL_BASE + 288)
 #define __NR_bind                         (__NR_SYSCALL_BASE + 282)
@@ -329,6 +330,7 @@
 #define __NR_unshare                      (__NR_SYSCALL_BASE + 310)
 #define __NR_getcpu                       (__NR_SYSCALL_BASE + 318)
 #define __NR_utimensat                    (__NR_SYSCALL_BASE + 320)
+#define __NR_signalfd4                    (__NR_SYSCALL_BASE + 327)
 #define __NR_eventfd2                     (__NR_SYSCALL_BASE + 328)
 #define __NR_pipe2                        (__NR_SYSCALL_BASE + 331)
 #define __NR_perf_event_open              (__NR_SYSCALL_BASE + 336)
@@ -463,6 +465,7 @@
 #define __NR_ioprio_set                   (__NR_SYSCALL_BASE + 314)
 #define __NR_ioprio_get                   (__NR_SYSCALL_BASE + 315)
 #define __NR_utimensat                    (__NR_SYSCALL_BASE + 316)
+#define __NR_signalfd4                    (__NR_SYSCALL_BASE + 324)
 #define __NR_eventfd2                     (__NR_SYSCALL_BASE + 325)
 #define __NR_pipe2                        (__NR_SYSCALL_BASE + 328)
 #define __NR_perf_event_open              (__NR_SYSCALL_BASE + 333)