Index: sys/sys/bitstring.h
===================================================================
--- sys/sys/bitstring.h
+++ sys/sys/bitstring.h
@@ -304,7 +304,7 @@
 	}
 
 	_mask = _match ? _BITSTR_MASK : 0;
-	_maxshft = _bit_idx(_size - 1) == 0 ? _size : _BITSTR_BITS;
+	_maxshft = _bit_idx(_size - 1) == 0 ? _size : (int)_BITSTR_BITS;
 	_value = 0;
 	_curbitstr = _bitstr + _bit_idx(_start);
 	_test = ~(_BITSTR_MASK << _bit_offset(_start));