diff --git a/Makefile b/Makefile
index 854951a..3807408 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC=gcc
-CFLAGS=-Wall -O2
+CFLAGS=-Wall -Wextra -Wpedantic -O2 -std=c99
 LDFLAGS=-lm
 
 ifndef VERBOSE