diff --git a/src/hardware/Makefile.am b/src/hardware/Makefile.am
index 737c3ebe..6fca05e8 100644
--- a/src/hardware/Makefile.am
+++ b/src/hardware/Makefile.am
@@ -8,5 +8,5 @@ libhardware_a_SOURCES = adlib.cpp dma.cpp gameblaster.cpp hardware.cpp iohandler
                         memory.cpp mixer.cpp pcspeaker.cpp pic.cpp sblaster.cpp tandy_sound.cpp timer.cpp \
 			vga.cpp vga.h vga_attr.cpp vga_crtc.cpp vga_dac.cpp vga_draw.cpp vga_fonts.cpp vga_gfx.cpp \
 			vga_memory.cpp vga_misc.cpp vga_seq.cpp font-switch.h ega-switch.h cmos.cpp disney.cpp \
-			gus.cpp
+			gus.cpp mpu401.cpp