diff --git a/tools/power/x86/turbostat/Makefile b/tools/power/x86/turbostat/Makefile
index e367b1a85d70b3e0b7d82c5766d83a31ce006d2a..8561e7ddca59e7ce4267f08039a8105df2771645 100644
--- a/tools/power/x86/turbostat/Makefile
+++ b/tools/power/x86/turbostat/Makefile
@@ -1,7 +1,7 @@
 CC		= $(CROSS_COMPILE)gcc
 BUILD_OUTPUT	:= $(CURDIR)
-PREFIX		:= /usr
-DESTDIR		:=
+PREFIX		?= /usr
+DESTDIR		?=
 
 ifeq ("$(origin O)", "command line")
 	BUILD_OUTPUT := $(O)