diff --git a/mach/6500/as/mach0.c b/mach/6500/as/mach0.c
index 7cf4e3b77..5d03fd166 100644
--- a/mach/6500/as/mach0.c
+++ b/mach/6500/as/mach0.c
@@ -1,4 +1,3 @@
-#define DUK
 #define RCSID0 "$Header$"
 
 /*
@@ -6,5 +5,4 @@
  */
 #define	THREE_PASS	/* Distinguish short and long branches. */
 #define	LISTING		/* Enable listing facilities. */
-#define RELOCATION	/* Produce relocation information. */
-#define NOLD		/* Output must be fed into separate linker. */
+#define ASLD
diff --git a/mach/6800/as/mach0.c b/mach/6800/as/mach0.c
index d979ec92b..0861d8069 100644
--- a/mach/6800/as/mach0.c
+++ b/mach/6800/as/mach0.c
@@ -1,4 +1,3 @@
-#define DUK
 #define RCSID0 "$Header$"
 
 /*
@@ -10,4 +9,3 @@
 #define THREE_PASS
 #define	LISTING
 #define RELOCATION
-#define NOLD
diff --git a/mach/i80/as/mach0.c b/mach/i80/as/mach0.c
index 94fae3143..a05659d3f 100644
--- a/mach/i80/as/mach0.c
+++ b/mach/i80/as/mach0.c
@@ -1,4 +1,3 @@
-#define DUK
 #define RCSID0 "$Header$"
 
 /*
@@ -6,4 +5,3 @@
  */
 #define	LISTING
 #define RELOCATION
-#define NOLD