diff --git a/add4/Makefile b/add4/Makefile
index a0c6826..d7b26b1 100644
--- a/add4/Makefile
+++ b/add4/Makefile
@@ -1,4 +1,4 @@
-CXXFLAGS += -std=c++11 -O3
+CXXFLAGS += -std=c++11 -O3 -fPIC

 all:  gpu-stream-hip