diff --git a/tools/Makefile b/tools/Makefile
index fb77c026..20e4b9a0 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -24,7 +24,7 @@ make_initrd: make_initrd.o
 	$(CC) $(CFLAGS) -o make_initrd $< $(LDFLAGS) 
 
 smp_setup.bin: smp_setup.asm
-	$(ASM) $(ASMFLAGS) -o $@ $<
+	$(NASM) $(ASMFLAGS) -o $@ $<
 
 smp_setup.hex: smp_setup.bin
 	hexdump -v -e '"0x" 1/1 "%02X" ", "' $< > $@