diff --git a/config.mk b/config.mk
index 8f06800..ead1859 100644
--- a/config.mk
+++ b/config.mk
@@ -4,7 +4,7 @@ VERSION = 0
 # customize below to fit your system
 
 # paths
-PREFIX ?= /usr/local
+PREFIX = /usr/local
 MANPREFIX = $(PREFIX)/share/man
 
 X11INC = /usr/X11R6/include