diff --git a/tja2fumen/constants.py b/tja2fumen/constants.py
index fd42a70..2e4a1a7 100644
--- a/tja2fumen/constants.py
+++ b/tja2fumen/constants.py
@@ -69,3 +69,24 @@ byte_strings = {
 }
 
 simpleHeaders = [b * 36 for b in [byte_strings['431'], byte_strings['V1'], byte_strings['V2']]]
+
+# This sample header for the "unknown header bytes" is built from the investigations in utils/validateHeaderMetadata
+# However, it's missing song-specific metadata from bytes 12, 16, 20, and (perhaps optionally), 76, 77 and 78.
+unknownHeaderSample = [0] * 80
+unknownHeaderSample[4] = 16
+unknownHeaderSample[5] = 39
+unknownHeaderSample[21] = 255
+unknownHeaderSample[22] = 255
+unknownHeaderSample[23] = 255
+unknownHeaderSample[26] = 1
+unknownHeaderSample[30] = 1
+unknownHeaderSample[34] = 1
+unknownHeaderSample[36] = 20
+unknownHeaderSample[40] = 10
+unknownHeaderSample[48] = 1
+unknownHeaderSample[52] = 20
+unknownHeaderSample[56] = 10
+unknownHeaderSample[60] = 1
+unknownHeaderSample[64] = 30
+unknownHeaderSample[68] = 30
+unknownHeaderSample[72] = 20
diff --git a/tja2fumen/converters.py b/tja2fumen/converters.py
index 8e7de99..cb896df 100644
--- a/tja2fumen/converters.py
+++ b/tja2fumen/converters.py
@@ -1,6 +1,6 @@
 from copy import deepcopy
 
-from constants import TJA_NOTE_TYPES
+from constants import TJA_NOTE_TYPES, unknownHeaderSample
 
 # Filler metadata that the `writeFumen` function expects
 default_note = {'type': '', 'pos': 0.0, 'item': 0, 'padding': 0.0,
@@ -162,7 +162,7 @@ def convertTJAToFumen(fumen, tja):
         # Append the measure to the tja's list of measures
         tjaConverted['measures'].append(measureFumen)
 
-    tjaConverted['headerUnknown'] = b'x\00' * 80
+    tjaConverted['headerUnknown'] = b"".join(i.to_bytes(1, 'little') for i in unknownHeaderSample)
     tjaConverted['order'] = '<'
     tjaConverted['length'] = len(tjaConverted['measures'])
     tjaConverted['unknownMetadata'] = 0