diff --git a/Makefile b/Makefile
index a31b01d0ff..d17f1fa884 100644
--- a/Makefile
+++ b/Makefile
@@ -82,6 +82,7 @@ ASFLAGS = -m32 -gdwarf-2 -Wa,-divide
 # FreeBSD ld wants ``elf_i386_fbsd''
 LDFLAGS += -m $(shell $(LD) -V | grep elf_i386 2>/dev/null | head -n 1)
 
+
 xv6.img: bootblock kernel
 	dd if=/dev/zero of=xv6.img count=10000
 	dd if=bootblock of=xv6.img conv=notrunc
@@ -133,7 +134,7 @@ tags: $(OBJS) entryother.S _init
 	etags *.S *.c
 
 vectors.S: vectors.pl
-	perl vectors.pl > vectors.S
+	./vectors.pl > vectors.S
 
 ULIB = ulib.o usys.o printf.o umalloc.o