diff --git a/src/cmd/5l/asm.c b/src/cmd/5l/asm.c
index 9e9c2c1ebb3..81c08e35354 100644
--- a/src/cmd/5l/asm.c
+++ b/src/cmd/5l/asm.c
@@ -1977,3 +1977,9 @@ genasmsym(void (*put)(Sym*, char*, int, vlong, vlong, int, Sym*))
 		Bprint(&bso, "symsize = %ud\n", symsize);
 	Bflush(&bso);
 }
+
+void
+setpersrc(Sym *s)
+{
+	USED(s);
+}
diff --git a/src/cmd/ld/lib.h b/src/cmd/ld/lib.h
index cd4608085fe..f69f5a35d43 100644
--- a/src/cmd/ld/lib.h
+++ b/src/cmd/ld/lib.h
@@ -202,6 +202,7 @@ void	addexport(void);
 void	dostkcheck(void);
 void	undef(void);
 void	doweak(void);
+void	setpersrc(Sym*);
 
 int	pathchar(void);
 void*	mal(uint32);