diff --git a/src/devices/disk/zip.c b/src/devices/disk/zip.c
index 3a7e6be..8f2ff52 100644
--- a/src/devices/disk/zip.c
+++ b/src/devices/disk/zip.c
@@ -1810,7 +1810,7 @@ do_command(void *p, uint8_t *cdb)
 			preamble_len = 4;
 			size_idx = 3;
 
-			dev->buffer[idx++] = 05;
+			dev->buffer[idx++] = 0;
 			dev->buffer[idx++] = cdb[2];
 			dev->buffer[idx++] = 0;