diff --git a/sample_mm/Makefile b/sample_mm/Makefile
index d0ab237..9a1b3a1 100644
--- a/sample_mm/Makefile
+++ b/sample_mm/Makefile
@@ -26,7 +26,7 @@ OBJECTS = sample_mm.cpp
 ##############################################
 
 OPT_FLAGS = -O3 -funroll-loops -pipe
-GCC4_FLAGS = -fvisibility=hidden -fvisibility-inlines-hidden
+GCC4_FLAGS = -fvisibility=hidden -fvisibility-inlines-hidden -std=c++11
 DEBUG_FLAGS = -g -ggdb3 -D_DEBUG
 CPP = gcc
 CPP_OSX = clang