diff --git a/server/Makefile b/server/Makefile
index d1d4385..d857c13 100644
--- a/server/Makefile
+++ b/server/Makefile
@@ -3,10 +3,8 @@ PKG_CONFIG ?= pkg-config
 BINMODE ?= 755
 BINEXT ?=
 
+PREFIX ?= /usr/local
 INSTALLROOT ?= $(DESTDIR)$(PREFIX)
-ifeq ($(INSTALLROOT),)
-	INSTALLROOT = /usr/local
-endif
 
 SINSTALLDIR ?= $(INSTALLROOT)/bin
 INSTALLDIRMODE ?= 755
diff --git a/src/Makefile b/src/Makefile
index 08deabd..e622a1b 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3,10 +3,8 @@ PKG_CONFIG ?= pkg-config
 BINMODE ?= 755
 BINEXT ?=
 
+PREFIX ?= /usr/local
 INSTALLROOT ?= $(DESTDIR)$(PREFIX)
-ifeq ($(INSTALLROOT),)
-	INSTALLROOT = /usr/local
-endif
 
 INSTALLDIR ?= $(INSTALLROOT)/bin
 INSTALLDIRMODE ?= 755