diff --git a/Source/HBIOS/Build.cmd b/Source/HBIOS/Build.cmd
index 9fadd909..b5967ec5 100644
--- a/Source/HBIOS/Build.cmd
+++ b/Source/HBIOS/Build.cmd
@@ -96,7 +96,7 @@ copy /b romldr.bin + dbgmon.bin + ..\zsdos\zsys_wbw.bin osimg_small.bin || exit
 ::
 
 for %%f in (hbios_rom.bin osimg.bin osimg1.bin osimg2.bin) do (
-  "%TOOLS%\srecord\srec_cat.exe" %%f -Binary -Crop 0 0x7FFF -checksum-neg-b-e 0x7FFF 1 1 -o %%f -Binary
+  "%TOOLS%\srecord\srec_cat.exe" %%f -Binary -Crop 0 0x7FFF -Checksum_Negative_Big_Endian 0x7FFF 1 1 -o %%f -Binary || exit /b
 )
 
 ::
diff --git a/Source/HBIOS/Makefile b/Source/HBIOS/Makefile
index 11edb245..cc7a94be 100644
--- a/Source/HBIOS/Makefile
+++ b/Source/HBIOS/Makefile
@@ -57,7 +57,7 @@ $(ROMNAME).rom $(ROMNAME).com $(ROMNAME).img &: $(ROMDEPS)
 		cat camel80.bin nascom.bin tastybasic.bin game.bin eastaegg.bin netboot.mod updater.bin usrrom.bin >osimg1.bin ; \
 		cat imgpad2.bin >osimg2.bin ; \
 		for f in hbios_rom.bin osimg.bin osimg1.bin osimg2.bin ; do \
-			srec_cat $$f -Binary -Crop 0 0x7FFF -checksum-neg-b-e 0x7FFF 1 1 -o $$f -Binary ; \
+			srec_cat $$f -Binary -Crop 0 0x7FFF -Checksum_Negative_Big_Endian 0x7FFF 1 1 -o $$f -Binary ; \
 		done \
 	fi
 	if [ $(ROM_PLATFORM) = UNA ] ; then \