diff --git a/Makefile b/Makefile
index deeefd0..b48ba76 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ INCLUDEDIR := $(PREFIX)/include
 CC := cc
 AR := ar
 RANLIB := ranlib
-CFLAGS := 
+CFLAGS := -O2 -Wall -Wextra -Wshadow -ansi -pedantic -std=c99
 LDFLAGS := 
 
 Q := @
diff --git a/project.zsh b/project.zsh
index 0a4e283..4955944 100644
--- a/project.zsh
+++ b/project.zsh
@@ -2,6 +2,8 @@
 package=perfect-os-junk
 version=0.0.1
 
+CFLAGS="-O2 -Wall -Wextra -Wshadow -ansi -pedantic -std=c99"
+
 targets=(libposj)
 type[libposj]=library
 sources[libposj]="$(echo lib/*.c)"