1diff --git a/Makefile b/Makefile
2index dddea44..fdb9401 100644
3--- a/Makefile
4+++ b/Makefile
5@@ -30,8 +30,8 @@ all:
6 PREFIX = /usr/local
7
8 install: all
9- install src/libpcg_random.a $PREFIX/lib
10- install -m 0644 include/pcg_variants.h $PREFIX/include
11+ install src/libpcg_random.a ${PREFIX}/lib
12+ install -m 0644 include/pcg_variants.h ${PREFIX}/include
13
14 test: all
15 cd test-low; $(MAKE) test