diff --git a/stm-firmware/crc-patcher/crc-patch-elf.py b/stm-firmware/crc-patcher/crc-patch-elf.py
index 9a20386..64e3439 100755
--- a/stm-firmware/crc-patcher/crc-patch-elf.py
+++ b/stm-firmware/crc-patcher/crc-patch-elf.py
@@ -89,7 +89,8 @@ with open(filename, 'r+b') as f:
 		print('Section for flash CRC missing!')
 		sys.exit(-1)
 	if flashcrc_sec.data_size != 6*4:
-		print("Warning!!! .flashcrc section has wrong size:",flashcrc_sec.data_size)
+		print("Error: .flashcrc section has wrong size:",flashcrc_sec.data_size)
+		sys.exit(-1);
 
 	crc_sec_data = bytearray(flashcrc_sec.data())
 	magic1 = struct.unpack('<I'*1, bytes(crc_sec_data[0:4]))[0]
@@ -110,4 +111,4 @@ with open(filename, 'r+b') as f:
 	f.write(crc_sec_data)
 	print('CRCs patched successfully')
 
-	
\ No newline at end of file
+