diff --git a/src/archive/plugins/Iso9660ArchivePlugin.cxx b/src/archive/plugins/Iso9660ArchivePlugin.cxx
index f0123e58f..56bf15c28 100644
--- a/src/archive/plugins/Iso9660ArchivePlugin.cxx
+++ b/src/archive/plugins/Iso9660ArchivePlugin.cxx
@@ -266,7 +266,7 @@ Iso9660InputStream::Read(std::unique_lock<Mutex> &,
 
 		const lsn_t read_lsn = lsn + offset / ISO_BLOCKSIZE;
 
-		if (read_size >= ISO_BLOCKSIZE) {
+		if (read_size >= ISO_BLOCKSIZE && skip == 0) {
 			/* big read - read right into the caller's buffer */
 
 			auto nbytes = iso->SeekRead(ptr, read_lsn,