diff --git a/board/ti/am335x/Makefile b/board/ti/am335x/Makefile
index e3609bc..ca50eef 100644
--- a/board/ti/am335x/Makefile
+++ b/board/ti/am335x/Makefile
@@ -18,7 +18,9 @@
 
 LIB	= $(obj)lib$(BOARD).o
 
+ifdef CONFIG_SPL_BUILD
 COBJS	:= mux.o
+endif
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))