diff --git a/arch/z80/src/z80/Make.defs b/arch/z80/src/z80/Make.defs
index 05dc8cd56f..d4e38b11cc 100644
--- a/arch/z80/src/z80/Make.defs
+++ b/arch/z80/src/z80/Make.defs
@@ -41,7 +41,11 @@ CMN_CSRCS	= up_initialize.c up_allocateheap.c up_initialstate.c \
 		  up_blocktask.c  up_unblocktask.c up_exit.c up_releasepending.c \
 		  up_reprioritizertr.c up_copystate.c up_irq.c up_idle.c \
 		  up_assert.c up_mdelay.c up_udelay.c \
-		  up_registerdump.c up_usestack.c \
+		  up_registerdump.c up_usestack.c
+
+ifneq ($(CONFIG_DISABLE_SIGNALS),y)
+CMD_CSRCS	+= up_schedulesigaction.c up_sigdeliver.c
+endif
 
 CHIP_ASRCS	= 
 CHIP_CSRCS	=