diff --git a/usr.bin/truss/syscalls.c b/usr.bin/truss/syscalls.c
index 1df36775abb..d69aefd8316 100644
--- a/usr.bin/truss/syscalls.c
+++ b/usr.bin/truss/syscalls.c
@@ -461,6 +461,10 @@ static struct syscall decoded_syscalls[] = {
 	{ .name = "setsockopt", .ret_type = 1, .nargs = 5,
 	  .args = { { Int, 0 }, { Sockoptlevel, 1 }, { Sockoptname, 2 },
 		    { Ptr | IN, 3 }, { Socklent, 4 } } },
+	{ .name = "shm_open", .ret_type = 1, .nargs = 3,
+	  .args = { { Name | IN, 0 }, { Open, 1 }, { Octal, 2 } } },
+	{ .name = "shm_unlink", .ret_type = 1, .nargs = 1,
+	  .args = { { Name | IN, 0 } } },
 	{ .name = "shutdown", .ret_type = 1, .nargs = 2,
 	  .args = { { Int, 0 }, { Shutdown, 1 } } },
 	{ .name = "sigaction", .ret_type = 1, .nargs = 3,