Index: src/OFZIPArchive.m
==================================================================
--- src/OFZIPArchive.m
+++ src/OFZIPArchive.m
@@ -513,11 +513,11 @@
 		@throw [OFNotOpenException exceptionWithObject: self];
 
 	if (_atEndOfStream)
 		return 0;
 
-	if (length > UINT64_MAX)
+	if (sizeof(length) >= sizeof(uint64_t) && length > UINT64_MAX)
 		@throw [OFOutOfRangeException exception];
 
 	if ((uint64_t)length > _toRead)
 		length = (size_t)_toRead;