diff --git a/Makefile b/Makefile
index 9208829..87fa1b8 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ TARGET_ARCH=linux64
 
 CC       = g++
 # compiling flags here
-CFLAGS   = -Wall -I. -O3 -std=c++11 -g -Wall -Wextra -Wunused-function
+CFLAGS   = -Wall -I. -O3 -std=c++11 -g -Wextra -Wunused-function