diff --git a/Makefile b/Makefile
index cf5223a6..f235854f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-CXXFLAGS=-Wall -O3 -std=c++11 -DNDEBUG -march=native
+CXXFLAGS=-Wall -O3 -std=c++11 -DNDEBUG #-march=native
 ZLIB=/mnt/lustre/groups/ukbiobank/Edinburgh_Data/Software/PRSice-cpp_development/PRSice.code/lib/zlib-1.2.11/build/libz.a 
 CXX=/opt/apps/compilers/gcc/6.2.0/bin/g++
 INCLUDES := -I inc/ -isystem lib/ -isystem lib/zlib-1.2.11/ -isystem lib/eigen-git-mirror