diff --git a/lib/std/c/linux.zig b/lib/std/c/linux.zig
index c00fc68bca..f37fce7a3e 100644
--- a/lib/std/c/linux.zig
+++ b/lib/std/c/linux.zig
@@ -93,6 +93,8 @@ pub extern "c" fn sendfile(
 
 pub extern "c" fn copy_file_range(fd_in: fd_t, off_in: ?*i64, fd_out: fd_t, off_out: ?*i64, len: usize, flags: c_uint) isize;
 
+pub extern "c" fn signalfd(fd: fd_t, mask: *const sigset_t, flags: i32) usize;
+
 pub const pthread_attr_t = extern struct {
     __size: [56]u8,
     __align: c_long,