diff --git a/Makefile b/Makefile
index 82603c41f6..b9bd7aeb43 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,14 @@
+VERSION=1.2.0
 DATE=$(shell DATE)
-BOOTSTRAP = ./bootstrap-1.2.0.css
-BOOTSTRAP_MIN = ./bootstrap-1.2.0.min.css
+BOOTSTRAP = ./bootstrap-${VERSION}.css
+BOOTSTRAP_MIN = ./bootstrap-${VERSION}.min.css
 BOOTSTRAP_LESS = ./lib/bootstrap.less
 LESS_COMPESSOR ?= `which lessc`
 WATCHR ?= `which watchr`
 
 build:
 	@@if test ! -z ${LESS_COMPESSOR}; then \
-		sed 's/@DATE/'"${DATE}"'/' ${BOOTSTRAP_LESS} >${BOOTSTRAP_LESS}.tmp; \
+		sed -e 's/@VERSION/'"v${VERSION}"'/' -e 's/@DATE/'"${DATE}"'/' <${BOOTSTRAP_LESS} >${BOOTSTRAP_LESS}.tmp; \
 		lessc ${BOOTSTRAP_LESS}.tmp > ${BOOTSTRAP}; \
 		lessc ${BOOTSTRAP_LESS}.tmp > ${BOOTSTRAP_MIN} --compress; \
 		rm -f ${BOOTSTRAP_LESS}.tmp; \
diff --git a/lib/bootstrap.less b/lib/bootstrap.less
index c31bd725da..a46a6a7605 100644
--- a/lib/bootstrap.less
+++ b/lib/bootstrap.less
@@ -1,5 +1,5 @@
 /*!
- * Bootstrap v1.2.0
+ * Bootstrap @VERSION
  *
  * Copyright 2011 Twitter, Inc
  * Licensed under the Apache License v2.0