diff --git a/usr.bin/truss/syscall.h b/usr.bin/truss/syscall.h
index 675256f24d35..0d217ab29fff 100644
--- a/usr.bin/truss/syscall.h
+++ b/usr.bin/truss/syscall.h
@@ -45,7 +45,7 @@ enum Argtype { None = 1, Hex, Octal, Int, UInt, LongHex, Name, Ptr, Stat, Ioctl,
 	Pathconf, Rforkflags, ExitStatus, Waitoptions, Idtype, Procctl,
 	LinuxSockArgs, Umtxop, Atfd, Atflags, Timespec2, Accessmode, Long,
 	Sysarch, ExecArgs, ExecEnv, PipeFds, QuadHex, Utrace, IntArray, Pipe2,
-	CapFcntlRights, Fadvice, FileFlags, Flockop,
+	CapFcntlRights, Fadvice, FileFlags, Flockop, Getfsstatmode,
 
 	CloudABIAdvice, CloudABIClockID, ClouduABIFDSFlags,
 	CloudABIFDStat, CloudABIFileStat, CloudABIFileType,
diff --git a/usr.bin/truss/syscalls.c b/usr.bin/truss/syscalls.c
index eb5a7546122f..db6cf8ad02b4 100644
--- a/usr.bin/truss/syscalls.c
+++ b/usr.bin/truss/syscalls.c
@@ -158,6 +158,8 @@ static struct syscall decoded_syscalls[] = {
 	  .args = { { Int, 0 }, { Timeval2 | IN, 1 } } },
 	{ .name = "futimesat", .ret_type = 1, .nargs = 3,
 	  .args = { { Atfd, 0 }, { Name | IN, 1 }, { Timeval2 | IN, 2 } } },
+	{ .name = "getfsstat", .ret_type = 1, .nargs = 3,
+	  .args = { { Ptr, 0 }, { Long, 1 }, { Getfsstatmode, 2 } } },
 	{ .name = "getitimer", .ret_type = 1, .nargs = 2,
 	  .args = { { Int, 0 }, { Itimerval | OUT, 2 } } },
 	{ .name = "getpeername", .ret_type = 1, .nargs = 3,
@@ -1887,6 +1889,10 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
 	case Flockop:
 		print_mask_arg(sysdecode_flock_operation, fp, args[sc->offset]);
 		break;
+	case Getfsstatmode:
+		print_integer_arg(sysdecode_getfsstat_mode, fp,
+		    args[sc->offset]);
+		break;
 
 	case CloudABIAdvice:
 		fputs(xlookup(cloudabi_advice, args[sc->offset]), fp);