diff --git a/Makefile b/Makefile
index 2056a53..37d9011 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@
 # the Free Software Foundation; either version 2 of the License, or
 # (at your option) any later version.
 
-DESTDIR	=
+DESTDIR	?=
 prefix	= /usr/local
 bindir	= $(prefix)/bin
 sbindir	= $(prefix)/sbin