@@ -535,11 +535,11 @@
 		maxZerosStart = zerosStart;
 		maxZerosCount = zerosCount;
 	}
 
 	if (maxZerosCount >= 2) {
-		for (uint_fast8_t i = 0; i < maxZerosStart; i += 2) {
+		for (int_fast8_t i = 0; i < maxZerosStart; i += 2) {
 			[string appendFormat:
 			    (first ? @"%x" : @":%x"),
 			    (addrIn6->sin6_addr.s6_addr[i] << 8) |
 			    addrIn6->sin6_addr.s6_addr[i + 1]];
 			first = false;
@@ -546,11 +546,11 @@
 		}
 
 		[string appendString: @"::"];
 		first = true;
 
-		for (uint_fast8_t i = maxZerosStart + (maxZerosCount * 2);
+		for (int_fast8_t i = maxZerosStart + (maxZerosCount * 2);
 		    i < 16; i += 2) {
 			[string appendFormat:
 			    (first ? @"%x" : @":%x"),
 			    (addrIn6->sin6_addr.s6_addr[i] << 8) |
 			    addrIn6->sin6_addr.s6_addr[i + 1]];