diff --git a/Makefile b/Makefile
index 1a9fb47..6da3458 100644
--- a/Makefile
+++ b/Makefile
@@ -383,7 +383,7 @@
 ###############################################################################
 # Flash chip drivers and bus support infrastructure.
 
-CHIP_OBJS = jedec.o stm50.o w39.o w29ee011.o \
+CHIP_OBJS = memory_bus.o jedec.o stm50.o w39.o w29ee011.o \
 	sst28sf040.o 82802ab.o \
 	sst49lfxxxc.o sst_fwhub.o edi.o flashchips.o spi.o spi25.o spi25_statusreg.o \
 	spi95.o opaque.o sfdp.o en29lv640b.o at45db.o \