diff --git a/sys/src/cmd/7l/asm.c b/sys/src/cmd/7l/asm.c
index 0cc5a27ec..0b3b444fa 100644
--- a/sys/src/cmd/7l/asm.c
+++ b/sys/src/cmd/7l/asm.c
@@ -493,7 +493,7 @@ datblk(long s, long n, int str)
 		}
 		if(l >= n)
 			continue;
-		if(p->as != AINIT && p->as != ADYNT) {
+		if(p->as != AINIT && p->as != ADYNT && !p->from.sym->dupok) {
 			for(j=l+(c-i)-1; j>=l; j--)
 				if(buf.dbuf[j]) {
 					print("%P\n", p);
diff --git a/sys/src/cmd/7l/l.h b/sys/src/cmd/7l/l.h
index 55ff29b8d..8d13a7914 100644
--- a/sys/src/cmd/7l/l.h
+++ b/sys/src/cmd/7l/l.h
@@ -81,6 +81,7 @@ struct	Sym
 	short	version;
 	short	become;
 	short	frame;
+	char	dupok;
 	uchar	subtype;
 	ushort	file;
 	vlong	value;
diff --git a/sys/src/cmd/7l/obj.c b/sys/src/cmd/7l/obj.c
index fc709843d..081e7ed0b 100644
--- a/sys/src/cmd/7l/obj.c
+++ b/sys/src/cmd/7l/obj.c
@@ -839,6 +839,8 @@ loop:
 			diag("GLOBL must have a name\n%P", p);
 			errorexit();
 		}
+		if(p->reg & DUPOK)
+			s->dupok = 1;
 		if(s->type == 0 || s->type == SXREF) {
 			s->type = SBSS;
 			s->value = 0;
@@ -1122,7 +1124,7 @@ lookup(char *symb, int v)
 	s->version = v;
 	s->value = 0;
 	s->sig = 0;
-//	s->dupok = 0;
+	s->dupok = 0;
 	hash[h] = s;
 	return s;
 }