diff --git a/desmume/configure.ac b/desmume/configure.ac
index aed70e013..ee95bcdee 100644
--- a/desmume/configure.ac
+++ b/desmume/configure.ac
@@ -214,7 +214,7 @@ if test "x[$]ENABLE_HARDCORE" = "x1"; then
     dnl - only valid for C with newer gcc's
     CPPFLAGS="[$]CPPFLAGS -Wmissing-prototypes"
   fi
-  CPPFLAGS="[$]CPPFLAGS -Wall -Wextra -Wno-missing-field-initializers -Wpointer-arith -Wcast-align -Wwrite-strings -Wno-unused-parameter -Wmissing-declarations -Wundef -Wmissing-noreturn -Wshadow"
+   CPPFLAGS="[$]CPPFLAGS -Wall -Wextra -D_FORTIFY_SOURCE=2 -Wno-missing-field-initializers -Wpointer-arith -Wcast-align -Wwrite-strings -Wno-unused-parameter -Wmissing-declarations -Wundef -Wmissing-noreturn -Wshadow -Wredundant-decls -Wformat-nonliteral -Wformat-security -Wswitch-enum -Winit-self"
 fi
 
 dnl - Enable debug mode