Index: src/OFLHAArchive_LHStream.m
==================================================================
--- src/OFLHAArchive_LHStream.m
+++ src/OFLHAArchive_LHStream.m
@@ -277,11 +277,11 @@
 						return bytesWritten;
 
 					skipCount = bits + 20;
 					break;
 				default:
-					assert(0);
+					OF_ENSURE(0);
 				}
 
 				if OF_UNLIKELY (_codesReceived + skipCount >
 				    _codesCount)
 					@throw [OFInvalidFormatException

Index: src/OFTarArchive.m
==================================================================
--- src/OFTarArchive.m
+++ src/OFTarArchive.m
@@ -52,11 +52,11 @@
 	OFTarArchiveEntry *_entry;
 	OF_KINDOF(OFStream *) _stream;
 	uint64_t _toWrite;
 }
 
-- (instancetype)of_initWithStream: (OFStream *)stream
+- (instancetype)of_initWithStream: (OF_KINDOF(OFStream *))stream
 			    entry: (OFTarArchiveEntry *)entry;
 @end
 
 @implementation OFTarArchive: OFObject
 @synthesize encoding = _encoding;

Index: src/OFURL.m
==================================================================
--- src/OFURL.m
+++ src/OFURL.m
@@ -67,10 +67,12 @@
 {
 # if defined(OF_WINDOWS) || defined(OF_MSDOS)
 	path = [path stringByReplacingOccurrencesOfString: @"\\"
 					       withString: @"/"];
 	path = [path stringByPrependingString: @"/"];
+
+	return path;
 # elif defined(OF_AMIGAOS)
 	OFArray OF_GENERIC(OFString *) *components = [path pathComponents];
 	OFMutableString *ret = [OFMutableString string];
 
 	for (OFString *component in components) {
@@ -98,10 +100,12 @@
 {
 # if defined(OF_WINDOWS) || defined(OF_MSDOS)
 	path = [path substringWithRange: of_range(1, [path length] - 1)];
 	path = [path stringByReplacingOccurrencesOfString: @"/"
 					       withString: @"\\"];
+
+	return path;
 # elif defined(OF_AMIGAOS)
 	OFMutableArray OF_GENERIC(OFString *) *components;
 	size_t count;
 
 	path = [path substringWithRange: of_range(1, [path length] - 1)];