diff --git a/src/arch/msp430fr5969lp/Makefile.inc b/src/arch/msp430fr5969lp/Makefile.inc
index d639a9db7d42a9236a452ba68cefa52ef543fc41..aeeb21302364446be6e384b18ddd1748f76044cc 100644
--- a/src/arch/msp430fr5969lp/Makefile.inc
+++ b/src/arch/msp430fr5969lp/Makefile.inc
@@ -34,6 +34,7 @@ endif
 ifneq ($(findstring softi2c,${drivers}), )
 else ifneq ($(findstring i2c,${arch_drivers}), )
 	TARGETS += src/arch/msp430fr5969lp/driver/i2c.cc
+	COMMON_FLAGS += -DDRIVER_I2C
 endif
 
 ifneq ($(findstring spi_a1,${arch_drivers}), )