diff --git a/first_diff.py b/first_diff.py
index 65af158712..ab2db2f1cc 100755
--- a/first_diff.py
+++ b/first_diff.py
@@ -40,7 +40,7 @@ def firstDiffMain():
     BUILTROM = Path(f"oot-{args.oot_version}.z64")
     BUILTMAP = buildFolder / "z64.map"
 
-    EXPECTEDROM = Path(f"baseroms/{args.version}/baserom-decompressed.z64")
+    EXPECTEDROM = Path(f"baseroms/{args.oot_version}/baserom-decompressed.z64")
     EXPECTEDMAP = "expected" / BUILTMAP
 
     mapfile_parser.frontends.first_diff.doFirstDiff(BUILTMAP, EXPECTEDMAP, BUILTROM, EXPECTEDROM, args.count, mismatchSize=True, addColons=args.add_colons, bytesConverterCallback=decodeInstruction)