diff --git a/Makefile.in b/Makefile.in
index 5dfcb42..6c449de 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -39,8 +39,8 @@ CXXFLAGS+=@CXXOPTIMISE_FLAG@
 CXXFLAGS+=@CXXDEBUG_FLAG@
 LIBS=-lstdc++
 INSTALL=@INSTALL@
-DESTDIR=@prefix@
-BINDIR=$(DESTDIR)/sbin
+PREFIX=@prefix@
+BINDIR=$(DESTDIR)/$(PREFIX)/sbin
 
 .PHONEY: test-programs