diff --git a/firmware/Makefile b/firmware/Makefile
index c30dc9a7..eefe836f 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -29,6 +29,13 @@
 #   Makefile for compiling the Getting Started with SAM3S Microcontrollers project
 
 GIT_VERSION=$(shell $(TOP)/git-version-gen $(TOP)/.tarball-version)
+
+CFLAGS = \
+	 -Werror=format-security \
+	 -Wformat \
+	 -g \
+	 $(NULL)
+
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