diff --git a/board/netstal/hcu4/Makefile b/board/netstal/hcu4/Makefile
index c0d719f..b13d9d4 100644
--- a/board/netstal/hcu4/Makefile
+++ b/board/netstal/hcu4/Makefile
@@ -27,11 +27,11 @@
 vpath nm_bsp.c ../common
 
 # NOBJS : Netstal common objects
-NOBJS	= fixed_sdram.o hcu_flash.o nm_bsp.o
+NOBJS	= ../common/fixed_sdram.o ../common/hcu_flash.o ../common/nm_bsp.o
 COBJS	= $(BOARD).o
 SOBJS	=
 
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c) ../common/$(NOBJS:.o=.c)
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c) $(NOBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 NOBJS	:= $(addprefix $(obj),$(NOBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
diff --git a/board/netstal/hcu4/hcu4.c b/board/netstal/hcu4/hcu4.c
index 714b98e..4fbe701 100644
--- a/board/netstal/hcu4/hcu4.c
+++ b/board/netstal/hcu4/hcu4.c
@@ -37,6 +37,7 @@
 #if defined(DEBUG)
 void show_sdram_registers(void);
 #endif
+long int fixed_hcu4_sdram (unsigned int dram_size);
 
 /*
  * This function is run very early, out of flash, and before devices are