diff --git a/mach/pdp/as/mach4.c b/mach/pdp/as/mach4.c
index 2921e443a..ec83c0cef 100644
--- a/mach/pdp/as/mach4.c
+++ b/mach/pdp/as/mach4.c
@@ -88,6 +88,8 @@ opr2
 op2
 	: ari
 		{ $$ = ( RDEFMODE | $1); }
+	| '*' REG
+		{ $$ = ( RDEFMODE | $2); }
 	| ainc
 		{ $$ = ( AIMODE | $1 ); }
 	| adec
diff --git a/mach/pdp/as/mach5.c b/mach/pdp/as/mach5.c
index 5e066d02b..ea232ea73 100644
--- a/mach/pdp/as/mach5.c
+++ b/mach/pdp/as/mach5.c
@@ -73,7 +73,7 @@ ejump(opc, exp) expr_t exp; {
 			emit2((opc^0400) | 04);
 		}
 
-		exp_1.val = exp.val;
+		exp_1 = exp;
 		im1flag = 1;
 		jump(0100,067);
 # ifdef THREE_PASS