diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@
 BUILD_NUMBER ?= 0
 
 # SOURCES: list of sources in the user application
-SOURCES = main.c  adc.c gpio.c i2c.c interrupts.c usart.c  gps.c system_stm32f0xx.c
+SOURCES = main.c  adc.c gpio.c i2c.c interrupts.c uart.c  gps.c system_stm32f0xx.c system.c wspr.c
 # TARGET: name of the user application
 TARGET = wsprhab-b$(BUILD_NUMBER)