diff --git a/arch/z80/src/Makefile.sdcc b/arch/z80/src/Makefile.sdcc
index 8865ad4b99e..840087e3041 100644
--- a/arch/z80/src/Makefile.sdcc
+++ b/arch/z80/src/Makefile.sdcc
@@ -208,9 +208,9 @@ endif
 nuttx$(EXEEXT): pass1.ihx nuttx.ihx
 	@rm -f pass1.*
 	@cp -f nuttx.map $(TOPDIR)/.
-ifeq ($(EXEEXT),.CMD)
+ifeq ($(EXEEXT),.cmd)
 	sed s/:00000001FF/:00520001AD/ nuttx.ihx | \
-	hex2cmd > $(TOPDIR)/NUTTX.CMD
+	hex2cmd > $(TOPDIR)/nuttx.cmd
 else
 	@packihx nuttx.ihx > $(TOPDIR)/nuttx$(EXEEXT)
 endif