diff --git a/scripts/buildbinary.py b/scripts/buildbinary.py
index bb2f49c..6660349 100644
--- a/scripts/buildbinary.py
+++ b/scripts/buildbinary.py
@@ -4,7 +4,7 @@
 # Copyright (C) 2022  Kevin O'Connor <kevin@koconnor.net>
 #
 # This file may be distributed under the terms of the GNU GPLv3 license.
-import sys, argparse
+import sys, argparse, struct
 
 ERR_MSG = """
 The CanBoot binary is too large for the configured APPLICATION_START.
@@ -13,10 +13,18 @@ Rerun "make menuconfig" and either increase the APPLICATION_START or
 disable features to reduce the final binary size.
 """
 
+def update_lpc176x_checksum(data):
+    data28 = data[:28]
+    words = struct.unpack('<IIIIIII', data28)
+    csum = (-sum(words)) & 0xffffffff
+    return data28 + struct.pack('<I', csum) + data[32:]
+
 def main():
     parser = argparse.ArgumentParser(description="Build CanBoot binary")
     parser.add_argument("-b", "--base", help="Address of flash start")
     parser.add_argument("-s", "--start", help="Address of application start")
+    parser.add_argument("-l", "--lpc176x", action='store_true',
+                        help="Perform lpc176x checksum")
     parser.add_argument("input_file", help="Raw binary filename")
     parser.add_argument("output_file", help="Final binary filename")
     args = parser.parse_args()
@@ -34,6 +42,9 @@ def main():
         sys.stderr.write(ERR_MSG + msg)
         sys.exit(-1)
 
+    if args.lpc176x:
+        data = update_lpc176x_checksum(data)
+
     f = open(args.output_file, 'wb')
     f.write(data)
     f.close()
diff --git a/src/lpc176x/Makefile b/src/lpc176x/Makefile
index 45e9fcc..d72b54a 100644
--- a/src/lpc176x/Makefile
+++ b/src/lpc176x/Makefile
@@ -25,7 +25,7 @@ src-$(CONFIG_SERIAL) += lpc176x/serial.c generic/serial_irq.c
 # Build the additional bin output file
 target-y += $(OUT)canboot.bin
 
-$(OUT)canboot.bin: $(OUT)canboot.elf
+$(OUT)canboot.bin: $(OUT)canboot.elf ./scripts/buildbinary.py
 	@echo "  Creating hex file $@"
 	$(Q)$(OBJCOPY) -O binary $< $(OUT)canboot.work
-	$(Q)$(PYTHON) ./scripts/buildbinary.py -b $(CONFIG_FLASH_START) -s $(CONFIG_APPLICATION_START) $(OUT)canboot.work $@
+	$(Q)$(PYTHON) ./scripts/buildbinary.py -b $(CONFIG_FLASH_START) -s $(CONFIG_APPLICATION_START) -l $(OUT)canboot.work $@
diff --git a/src/stm32/Makefile b/src/stm32/Makefile
index 37dd8a5..06ad2c1 100644
--- a/src/stm32/Makefile
+++ b/src/stm32/Makefile
@@ -61,7 +61,7 @@ src-$(CONFIG_CANSERIAL) += $(canbus-src-y) generic/canbus.c stm32/chipid.c
 # Binary output file rules
 target-y += $(OUT)canboot.bin
 
-$(OUT)canboot.bin: $(OUT)canboot.elf
+$(OUT)canboot.bin: $(OUT)canboot.elf ./scripts/buildbinary.py
 	@echo "  Creating hex file $@"
 	$(Q)$(OBJCOPY) -O binary $< $(OUT)canboot.work
 	$(Q)$(PYTHON) ./scripts/buildbinary.py -b $(CONFIG_FLASH_START) -s $(CONFIG_APPLICATION_START) $(OUT)canboot.work $@