diff --git a/src/lib/util/cdrom.h b/src/lib/util/cdrom.h
index 9d2f89839da..3ff7c9f063c 100644
--- a/src/lib/util/cdrom.h
+++ b/src/lib/util/cdrom.h
@@ -56,7 +56,7 @@
 #define CD_MAX_SUBCODE_DATA		(96)
 
 #define CD_FRAME_SIZE			(CD_MAX_SECTOR_DATA + CD_MAX_SUBCODE_DATA)
-#define CD_FRAMES_PER_HUNK		(8)
+#define CD_FRAMES_PER_HUNK		(4) // should be 8 for v5 CDs, with a 4-frame pad at the end to maintain SHA1 compatibility
 
 #define CD_METADATA_WORDS		(1+(CD_MAX_TRACKS * 6))