diff --git a/Makefile b/Makefile
index 5e4d6636..3e901084 100755
--- a/Makefile
+++ b/Makefile
@@ -338,7 +338,7 @@ endif
 $(BUILD_DIR)/kernal_combined.prg: $(ALL_BINS)
 ifeq ($(VARIANT), bsw128)
 	@echo Creating $@ from kernal.bin $(DRIVE).bin kernal2.bin relocator.bin $(INPUT).bin
-	printf "\x00\x48" > $(BUILD_DIR)/tmp.bin
+	printf "\0\110" > $(BUILD_DIR)/tmp.bin
 # relocator.bin($4800) @ $4800-$4C00 -> $4800
 	cat $(BUILD_DIR)/kernal/relocator.bin /dev/zero | dd bs=1 count=1024 >> $(BUILD_DIR)/tmp.bin 2> /dev/null
 # kernal.bin($5000)    @ $5000-$5400 -> $4C00
@@ -362,7 +362,7 @@ ifeq ($(VARIANT), bsw128)
 
 else
 	@echo Creating $@ from kernal.bin $(DRIVE).bin $(INPUT).bin
-	printf "\x00\x50" > $(BUILD_DIR)/tmp.bin
+	printf "\0\120" > $(BUILD_DIR)/tmp.bin
 	dd if=$(BUILD_DIR)/kernal/kernal.bin bs=1 count=16384 >> $(BUILD_DIR)/tmp.bin 2> /dev/null
 	cat $(BUILD_DIR)/drv/$(DRIVE).bin /dev/zero | dd bs=1 count=3456 >> $(BUILD_DIR)/tmp.bin 2> /dev/null
 	cat $(BUILD_DIR)/kernal/kernal.bin /dev/zero | dd bs=1 count=24832 skip=19840 >> $(BUILD_DIR)/tmp.bin 2> /dev/null