diff --git a/arch/z16/src/Makefile b/arch/z16/src/Makefile
index 02d9c6eb67..74e91dc75c 100644
--- a/arch/z16/src/Makefile
+++ b/arch/z16/src/Makefile
@@ -55,6 +55,9 @@ INCLUDES = $(ARCHSTDINCLUDES) $(USRINCLUDES)
 CFLAGS = $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(INCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
 CPPFLAGS += -I$(ARCHSRCDIR)
 
+KDEFINE = ${shell $(TOPDIR)/tools/define.sh "$(CC)" __KERNEL__}
+CFLAGS += $(KDEFINE)
+
 ifeq ($(CONFIG_WINDOWS_NATIVE),y)
   LDFLAGS += @"$(ARCHSRCDIR)/nuttx.linkcmd"
 else