diff --git a/GNUmakefile b/GNUmakefile
index 509c4f8..d8024b8 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -1,5 +1,6 @@
 VERSION = $(shell git describe --tags)
-BUILD_TMP?=.rpm_tmp
+BUILD_TMP ?= .rpm_tmp
+DEB_MAINTAINER ?= mengzhuo1203@gmail.com
 
 include common.mk
 
@@ -11,10 +12,9 @@ deb:
 	mkdir -p ${BUILD_TMP}/etc/systemd/system/
 	cp goircd ${BUILD_TMP}/usr/local/bin/
 	cp startup/goircd.service ${BUILD_TMP}/etc/systemd/system/
-	fpm -s dir -t deb -n goircd -v ${VERSION}\
-        -m mengzhuo1203@gmail.com \
+	fpm -s dir -t deb -n goircd -v ${VERSION} \
+        -m $(DEB_MAINTAINER) \
         --deb-compression=bzip2 \
         --verbose \
-        -d logrotate\
+        -d logrotate \
         -C ${BUILD_TMP}
-