Index: src/OFDeflateStream.m
==================================================================
--- src/OFDeflateStream.m
+++ src/OFDeflateStream.m
@@ -104,11 +104,11 @@
 					return false;
 				}
 
 				stream->_byte = stream->_buffer[0];
 				stream->_bufferIndex = 1;
-				stream->_bufferLength = length;
+				stream->_bufferLength = (uint_fast16_t)length;
 			}
 
 			stream->_bitIndex = 0;
 		}
 
@@ -296,13 +296,13 @@
 
 - (size_t)lowlevelReadIntoBuffer: (void*)buffer_
 			  length: (size_t)length
 {
 	uint8_t *buffer = buffer_;
-	uint_fast16_t bits;
+	uint_fast16_t bits, i, tmp;
 	uint16_t value;
-	size_t i, tmp, bytesWritten = 0;
+	size_t bytesWritten = 0;
 	uint8_t *slidingWindow;
 	uint_fast16_t slidingWindowIndex;
 
 	if (_atEndOfStream)
 		@throw [OFReadFailedException exceptionWithStream: self
@@ -387,14 +387,15 @@
 #define CTX _context.uncompressed
 		if OF_UNLIKELY (length == 0)
 			return bytesWritten;
 
 		tmp = (length < CTX.length - CTX.position
-		    ? length : CTX.length - CTX.position);
+		    ? (uint_fast16_t)length : CTX.length - CTX.position);
 
-		tmp = [_stream readIntoBuffer: buffer + bytesWritten
-				       length: tmp];
+		tmp = (uint_fast16_t)[_stream
+		    readIntoBuffer: buffer + bytesWritten
+			    length: tmp];
 
 		if OF_UNLIKELY (_slidingWindow == NULL) {
 			_slidingWindow =
 			    [self allocMemoryWithSize: _slidingWindowMask + 1];
 			/* Avoid leaking data */

Index: utils/objfw-unzip.m
==================================================================
--- utils/objfw-unzip.m
+++ utils/objfw-unzip.m
@@ -129,11 +129,11 @@
 			[output writeBuffer: buffer
 				     length: length];
 
 			written += length;
 			newPercent = (written == size
-			    ? 100 : written * 100 / size);
+			    ? 100 : (int_fast8_t)(written * 100 / size));
 
 			if (percent != newPercent) {
 				percent = newPercent;
 
 				[of_stdout writeFormat: