diff --git a/doc/Building.md b/doc/Building.md
index da209a063..f0b96624d 100644
--- a/doc/Building.md
+++ b/doc/Building.md
@@ -22,7 +22,7 @@ Install the prerequisites using APT:
 
 ```
 sudo apt-get install build-essential git patch wget unzip \
-gettext autoconf automake cmake libtool nasm ragel luarocks libsdl2-dev \
+gettext autoconf automake cmake libtool nasm ragel luarocks lua5.1 libsdl2-dev \
 libssl-dev libffi-dev libsdl2-dev libc6-dev-i386 xutils-dev linux-libc-dev:i386 zlib1g:i386
 ```