diff --git a/server/drivers/Makefile.am b/server/drivers/Makefile.am
index 0e7fe92..23bb5bf 100644
--- a/server/drivers/Makefile.am
+++ b/server/drivers/Makefile.am
@@ -4,7 +4,7 @@ EXTRA_libLCDdrivers_a_SOURCES = MtxOrb.c MtxOrb.h text.c text.h \
         lcdm001.c lcdm001.h \
         curses_drv.c curses_drv.h drv_base.h \
         hd44780.c hd44780.h lb216.c lb216.h \
-	hd44780-4bit.c hd44780-4bit.h \
+	hd44780-4bit.c hd44780-4bit.h lpt-port.h timing.h \
 	hd44780-ext8bit.c hd44780-ext8bit.h lcd_sem.c lcd_sem.h \
 	hd44780-serialLpt.c hd44780-serialLpt.h \
 	hd44780-winamp.c hd44780-winamp.h \