diff --git a/Makefile b/Makefile
index d54c702..292ef82 100644
--- a/Makefile
+++ b/Makefile
@@ -2,8 +2,6 @@ include /usr/share/dpkg/pkg-info.mk
 
 PACKAGE=proxmox-mailgateway
 
-GITVERSION:=$(shell git rev-parse HEAD)
-
 BUILDDIR=$(PACKAGE)-$(DEB_VERSION)
 DSC=$(PACKAGE)_$(DEB_VERSION).dsc
 
@@ -22,7 +20,7 @@ $(BUILDDIR): debian
 	rm -rf $@ $@.tmp
 	mkdir -p $@.tmp/debian
 	cp -a debian/ $@.tmp/
-	echo "git clone git://git.proxmox.com/git/proxmox-mailgateway.git\\ngit checkout $(GITVERSION)" > $@.tmp/debian/SOURCE
+	echo "git clone git://git.proxmox.com/git/proxmox-mailgateway.git\\ngit checkout $(shell git rev-parse HEAD)" > $@.tmp/debian/SOURCE
 	mv $@.tmp $@
 
 $(DEB): $(BUILDDIR)