diff --git a/Makefile.inc b/Makefile.inc
index 34b6642..d3f345c 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -1,3 +1,3 @@
-PACKAGES	= /srv/puppet/files/common/packages
-MANIFESTS	= $(PACKAGES)/manifests
-TIMESTAMP	= $(shell date +%Y%m%d-%H%M)
+PACKAGES  := /srv/puppet/files/common/packages
+MANIFESTS := $(PACKAGES)/manifests
+TIMESTAMP := $(shell date +%Y%m%d-%H%M)