diff --git a/Marlin/Makefile b/Marlin/Makefile
index 684e949acb..37435cad17 100644
--- a/Marlin/Makefile
+++ b/Marlin/Makefile
@@ -263,7 +263,7 @@ CXXSRC = WMath.cpp WString.cpp Print.cpp Marlin_main.cpp	\
 	SdFile.cpp SdVolume.cpp planner.cpp stepper.cpp \
 	temperature.cpp cardreader.cpp configuration_store.cpp \
 	watchdog.cpp SPI.cpp servo.cpp Tone.cpp ultralcd.cpp digipot_mcp4451.cpp \
-	vector_3.cpp qr_solve.cpp
+	vector_3.cpp qr_solve.cpp buzzer.cpp
 ifeq ($(LIQUID_TWI2), 0)
 CXXSRC += LiquidCrystal.cpp
 else