Index: src/OFZIPArchive.m
==================================================================
--- src/OFZIPArchive.m
+++ src/OFZIPArchive.m
@@ -941,11 +941,11 @@
 	return ret;
 }
 
 - (bool)lowlevelHasDataInReadBuffer
 {
-	return _decompressedStream.hasDataInReadBuffer;
+	return ((OFStream *)_decompressedStream).hasDataInReadBuffer;
 }
 
 - (int)fileDescriptorForReading
 {
 	return ((id <OFReadyForReadingObserving>)_decompressedStream)