diff --git a/arch/z80/src/Makefile.sdcc b/arch/z80/src/Makefile.sdcc
index 8865ad4b99..840087e304 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
diff --git a/configs/xtrs/nsh/Make.defs b/configs/xtrs/nsh/Make.defs
index 1c582dffb2..f73855d2a3 100644
--- a/configs/xtrs/nsh/Make.defs
+++ b/configs/xtrs/nsh/Make.defs
@@ -65,7 +65,7 @@ SDCCLIB			= z80.lib
 ASMEXT			= .asm
 OBJEXT			= .o
 LIBEXT			= .lib
-EXEEXT			= .CMD
+EXEEXT			= .cmd
 
 define COMPILE
 	@echo "CC: $1"
diff --git a/configs/xtrs/ostest/Make.defs b/configs/xtrs/ostest/Make.defs
index 47de3f0ee8..561fce02ee 100644
--- a/configs/xtrs/ostest/Make.defs
+++ b/configs/xtrs/ostest/Make.defs
@@ -65,7 +65,7 @@ SDCCLIB			= z80.lib
 ASMEXT			= .asm
 OBJEXT			= .o
 LIBEXT			= .lib
-EXEEXT			= .CMD
+EXEEXT			= .cmd
 
 define COMPILE
 	@echo "CC: $1"
diff --git a/configs/xtrs/pashello/Make.defs b/configs/xtrs/pashello/Make.defs
index 47de3f0ee8..561fce02ee 100644
--- a/configs/xtrs/pashello/Make.defs
+++ b/configs/xtrs/pashello/Make.defs
@@ -65,7 +65,7 @@ SDCCLIB			= z80.lib
 ASMEXT			= .asm
 OBJEXT			= .o
 LIBEXT			= .lib
-EXEEXT			= .CMD
+EXEEXT			= .cmd
 
 define COMPILE
 	@echo "CC: $1"