Index: src/OFTCPSocket.m
==================================================================
--- src/OFTCPSocket.m
+++ src/OFTCPSocket.m
@@ -469,11 +469,11 @@
 				break;
 			case 0x06:
 				errNo = ETIMEDOUT;
 				break;
 			case 0x07:
-				errNo = ENOTSUP;
+				errNo = EOPNOTSUPP;
 				break;
 			case 0x08:
 				errNo = EAFNOSUPPORT;
 				break;
 			default: