diff --git a/test/Makefile b/test/Makefile
index 5ac928a..54765af 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -6,7 +6,7 @@ WARNINGS=-W -Wall -Wstrict-prototypes -Wmissing-prototypes -Waggregate-return \
 # for x86 pentium+ machines , these flags work well
 #CFLAGS=-O3  -march=pentiumpro -ffast-math -fomit-frame-pointer   -I.. -I../tools $(WARNINGS)
 # If the above flags do not work, try the following
-CFLAGS=-O3 -ffast-math -fomit-frame-pointer  -I.. -I../tools $(WARNINGS) 
+CFLAGS=-O3 -mtune=native -ffast-math -fomit-frame-pointer  -I.. -I../tools $(WARNINGS) 
 # TIP: try adding -openmp or -fopenmp  to enable OPENMP directives and use of multiple cores