@@ -767,11 +767,11 @@
 				    newWithClass: isa];
 
 			if ((character & 0xFC00) == 0xD800) {
 				uint16_t nextCharacter;
 
-				if (length <= i + 1)
+				if (length_ <= i + 1)
 					@throw [OFInvalidEncodingException
 						newWithClass: isa];
 
 				nextCharacter = (swap
 				    ? of_bswap16(string_[i + 1])