@@ -684,20 +684,20 @@
 				if OF_UNLIKELY (_slidingWindow == NULL)
 					@throw [OFInvalidFormatException
 					    exception];
 
 				for (j = 0; j < CTX.length; j++) {
-					uint16_t index;
+					uint16_t idx;
 
 					if OF_UNLIKELY (length == 0) {
 						CTX.length -= j;
 						return bytesWritten;
 					}
 
-					index = (_slidingWindowIndex -
+					idx = (_slidingWindowIndex -
 					    CTX.distance) & _slidingWindowMask;
-					value = _slidingWindow[index];
+					value = _slidingWindow[idx];
 
 					buffer[bytesWritten++] = value;
 					length--;
 
 					_slidingWindow[_slidingWindowIndex] =