diff --git a/configure.ac b/configure.ac
index 32ce23c..00ae655 100644
--- a/configure.ac
+++ b/configure.ac
@@ -58,7 +58,12 @@
 add_cflag([-Wall])
 add_cflag([-Werror])
 add_cflag([-std=gnu99])
-add_ldflag([-fPIC])
+add_cflag([-Wformat])
+add_cflag([-Wformat-security])
+add_cflag([-Wstack-protector])
+add_cflag([-fstack-protector-all])
+add_cflag([-fpic])
+add_cflag([-fPIC])
 add_ldflag([-Wl,--no-undefined])
 
 AC_SUBST([EXTRA_CFLAGS])