diff --git a/src/fix.py b/src/fix.py
index a7267bb..9fdb4cc 100644
--- a/src/fix.py
+++ b/src/fix.py
@@ -1,8 +1,16 @@
 #!/usr/bin/env python3
 
 import config
+import hashlib
 
 def open_onikakushi() -> str:
+
+    with open(config.get('original_path'), 'rb') as f:
+        md5hash = "248cc760eb112d1fac1e42cdc4e5ef6f"
+        digest = hashlib.file_digest(f, "md5")
+        if digest.hexdigest() != md5hash:
+            raise Exception("Original script hashes do not match")
+
     outpath = 'tmp/onikakushi.txt'
     origfile = open(config.get('original_path'), 'r', encoding='shift_jisx0213')
     outfile = open(outpath, 'w', encoding='shift_jisx0213')