diff --git a/usr.bin/truss/syscall.h b/usr.bin/truss/syscall.h
index a9813f8e9bf..11a07ac4c70 100644
--- a/usr.bin/truss/syscall.h
+++ b/usr.bin/truss/syscall.h
@@ -48,7 +48,7 @@ enum Argtype { None = 1, Hex, Octal, Int, UInt, LongHex, Name, Ptr, Stat, Ioctl,
 	Sysarch, ExecArgs, ExecEnv, PipeFds, QuadHex, Utrace, IntArray, Pipe2,
 	CapFcntlRights, Fadvice, FileFlags, Flockop, Getfsstatmode, Kldsymcmd,
 	Kldunloadflags, Sizet, Madvice, Socklent, Sockprotocol, Sockoptlevel,
-	Sockoptname, Msgflags, CapRights, PUInt, PQuadHex,
+	Sockoptname, Msgflags, CapRights, PUInt, PQuadHex, Acltype,
 
 	CloudABIAdvice, CloudABIClockID, ClouduABIFDSFlags,
 	CloudABIFDStat, CloudABIFileStat, CloudABIFileType,
diff --git a/usr.bin/truss/syscalls.c b/usr.bin/truss/syscalls.c
index e6877e31ddd..cc1350ed2ac 100644
--- a/usr.bin/truss/syscalls.c
+++ b/usr.bin/truss/syscalls.c
@@ -77,6 +77,30 @@ __FBSDID("$FreeBSD$");
  */
 static struct syscall decoded_syscalls[] = {
 	/* Native ABI */
+	{ .name = "__acl_aclcheck_fd", .ret_type = 1, .nargs = 3,
+	  .args = { { Int, 0 }, { Acltype, 1 }, { Ptr, 2 } } },
+	{ .name = "__acl_aclcheck_file", .ret_type = 1, .nargs = 3,
+	  .args = { { Name, 0 }, { Acltype, 1 }, { Ptr, 2 } } },
+	{ .name = "__acl_aclcheck_link", .ret_type = 1, .nargs = 3,
+	  .args = { { Name, 0 }, { Acltype, 1 }, { Ptr, 2 } } },
+	{ .name = "__acl_delete_fd", .ret_type = 1, .nargs = 2,
+	  .args = { { Int, 0 }, { Acltype, 1 } } },
+	{ .name = "__acl_delete_file", .ret_type = 1, .nargs = 2,
+	  .args = { { Name, 0 }, { Acltype, 1 } } },
+	{ .name = "__acl_delete_link", .ret_type = 1, .nargs = 2,
+	  .args = { { Name, 0 }, { Acltype, 1 } } },
+	{ .name = "__acl_get_fd", .ret_type = 1, .nargs = 3,
+	  .args = { { Int, 0 }, { Acltype, 1 }, { Ptr, 2 } } },
+	{ .name = "__acl_get_file", .ret_type = 1, .nargs = 3,
+	  .args = { { Name, 0 }, { Acltype, 1 }, { Ptr, 2 } } },
+	{ .name = "__acl_get_link", .ret_type = 1, .nargs = 3,
+	  .args = { { Name, 0 }, { Acltype, 1 }, { Ptr, 2 } } },
+	{ .name = "__acl_set_fd", .ret_type = 1, .nargs = 3,
+	  .args = { { Int, 0 }, { Acltype, 1 }, { Ptr, 2 } } },
+	{ .name = "__acl_set_file", .ret_type = 1, .nargs = 3,
+	  .args = { { Name, 0 }, { Acltype, 1 }, { Ptr, 2 } } },
+	{ .name = "__acl_set_link", .ret_type = 1, .nargs = 3,
+	  .args = { { Name, 0 }, { Acltype, 1 }, { Ptr, 2 } } },
 	{ .name = "__cap_rights_get", .ret_type = 1, .nargs = 3,
 	  .args = { { Int, 0 }, { Int, 1 }, { CapRights | OUT, 2 } } },
 	{ .name = "__getcwd", .ret_type = 1, .nargs = 2,
@@ -2031,6 +2055,9 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
 			fprintf(fp, "0x%lx", args[sc->offset]);
 		break;
 	}
+	case Acltype:
+		print_integer_arg(sysdecode_acltype, fp, args[sc->offset]);
+		break;
 
 	case CloudABIAdvice:
 		fputs(xlookup(cloudabi_advice, args[sc->offset]), fp);