diff --git a/usr.bin/truss/syscalls.c b/usr.bin/truss/syscalls.c
--- a/usr.bin/truss/syscalls.c
+++ b/usr.bin/truss/syscalls.c
@@ -1950,9 +1950,9 @@
 		int i, first;
 
 		sig = args[sc->offset];
-		if (get_struct(pid, args[sc->offset], (void *)&ss,
+		if (get_struct(pid, sig, (void *)&ss,
 		    sizeof(ss)) == -1) {
-			print_pointer(fp, args[sc->offset]);
+			print_pointer(fp, sig);
 			break;
 		}
 		fputs("{ ", fp);