diff --git a/boot.sh b/boot.sh
index 54c1842..1a395f5 100644
--- a/boot.sh
+++ b/boot.sh
@@ -1,4 +1,4 @@
-cd build && 
+mkdir -p build && cd build && 
 cat ../boot-lib.h ../boot.c | sed '/^#/d' > boot-all.c &&
 gcc ../boot.c ../boot-lib.c -o gcc.out && 
 ./gcc.out < boot-all.c > boot1.s &&