diff --git a/package/m4/m4.mk b/package/m4/m4.mk
index 9887fd55f1..229e8ca541 100644
--- a/package/m4/m4.mk
+++ b/package/m4/m4.mk
@@ -3,10 +3,11 @@
 # m4
 #
 #############################################################
-M4_SOURCE:=m4-1.4.tar.gz
+M4_VER:=1.4
+M4_SOURCE:=m4-$(M4_VER).tar.gz
 M4_SITE:=ftp://ftp.gnu.org/gnu/m4
 M4_CAT:=zcat
-M4_DIR:=$(BUILD_DIR)/m4-1.4
+M4_DIR:=$(BUILD_DIR)/m4-$(M4_VER)
 M4_BINARY:=m4
 M4_TARGET_BINARY:=usr/bin/m4