diff --git a/programs/Makefile b/programs/Makefile
index e0a324f..9033875 100644
--- a/programs/Makefile
+++ b/programs/Makefile
@@ -3,8 +3,8 @@
 # To compile with PKCS11: add "-lpkcs11-helper" to LDFLAGS
 
 CFLAGS	?= -O2
-WARNING_CFLAGS ?= -Wall -Wextra
-WARNING_CXXFLAGS ?= -Wall -Wextra
+WARNING_CFLAGS ?= -Wall -Wextra -Wformat=2 -Wno-format-nonliteral
+WARNING_CXXFLAGS ?= -Wall -Wextra -Wformat=2 -Wno-format-nonliteral
 LDFLAGS ?=
 
 MBEDTLS_TEST_PATH:=../tests/src