diff --git a/config.mk b/config.mk
index 3c262ae..3bee6fa 100644
--- a/config.mk
+++ b/config.mk
@@ -2,7 +2,7 @@
 
 USR ?= /usr/local
 ETC ?= /etc
-PREFIX ?= /
+BIN ?= $(USR)/bin
 
-BINDIR = $(DESTDIR)$(PREFIX)/$(USR)/bin
-ETCDIR = $(DESTDIR)$(PREFIX)/$(ETC)
+BINDIR = $(DESTDIR)$(PREFIX)$(BIN)
+ETCDIR = $(DESTDIR)$(PREFIX)$(ETC)