diff --git a/common/Makefile b/common/Makefile
index ebb7635..083df17 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -120,6 +120,7 @@
 COBJS-$(CONFIG_ID_EEPROM) += cmd_mac.o
 COBJS-$(CONFIG_CMD_MD5SUM) += cmd_md5sum.o
 COBJS-$(CONFIG_CMD_MEMORY) += cmd_mem.o
+COBJS-$(CONFIG_CMD_IO) += cmd_io.o
 COBJS-$(CONFIG_CMD_MFSL) += cmd_mfsl.o
 COBJS-$(CONFIG_MII) += miiphyutil.o
 COBJS-$(CONFIG_CMD_MII) += miiphyutil.o