diff --git a/Makefile b/Makefile
index 0779f1e..062f636 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 ### VARIABLES ###
 
 CC = gcc
-CFLAGS = -lgraph
+CFLAGS = -lgraph -ansi
 SRCDIR = ./src
 HDIR = ./include
 ODIR = ./out