diff --git a/README.md b/README.md
index 1b43fa3..4419d02 100644
--- a/README.md
+++ b/README.md
@@ -128,6 +128,8 @@ see the ["resource forks" section of the mac_file_format_docs repo](https://gith
 
 * Added `open` and `open_raw` methods to `Resource` objects,
   for stream-based access to resource data.
+* Fixed reading of compressed resource headers with the header length field incorrectly set to 0
+  (because real Mac OS apparently accepts this).
 
 ### Version 1.8.0
 
diff --git a/src/rsrcfork/compress/common.py b/src/rsrcfork/compress/common.py
index 87c6c7c..8eedcee 100644
--- a/src/rsrcfork/compress/common.py
+++ b/src/rsrcfork/compress/common.py
@@ -46,8 +46,8 @@ class CompressedHeaderInfo(object):
 			raise DecompressError("Invalid header")
 		if signature != COMPRESSED_SIGNATURE:
 			raise DecompressError(f"Invalid signature: {signature!r}, expected {COMPRESSED_SIGNATURE!r}")
-		if header_length != 0x12:
-			raise DecompressError(f"Unsupported header length: 0x{header_length:>04x}, expected 0x12")
+		if header_length not in {0, 0x12}:
+			raise DecompressError(f"Unsupported header length value: 0x{header_length:>04x}, expected 0x12 or 0")
 		
 		if compression_type == COMPRESSED_TYPE_8:
 			working_buffer_fractional_size, expansion_buffer_size, dcmp_id, reserved = STRUCT_COMPRESSED_TYPE_8_HEADER.unpack(remainder)