diff --git a/lib/isc/win32/socket.c b/lib/isc/win32/socket.c
index 8964964102..cf101189f8 100644
--- a/lib/isc/win32/socket.c
+++ b/lib/isc/win32/socket.c
@@ -337,7 +337,6 @@ struct isc_socketmgr {
 	HANDLE hIoCompletionPort;
 	int maxIOCPThreads;
 	HANDLE hIOCPThreads[MAX_IOCPTHREADS];
-	DWORD dwIOCPThreadIds[MAX_IOCPTHREADS];
 	size_t maxudp;
 
 	/*
@@ -500,15 +499,8 @@ iocompletionport_createthreads(int total_threads, isc_socketmgr_t *manager) {
 	 * We need at least one
 	 */
 	for (i = 0; i < total_threads; i++) {
-		manager->hIOCPThreads[i] =
-			CreateThread(NULL, 0, SocketIoThread, manager, 0,
-				     &manager->dwIOCPThreadIds[i]);
-		if (manager->hIOCPThreads[i] == NULL) {
-			errval = GetLastError();
-			strerror_r(errval, strbuf, sizeof(strbuf));
-			FATAL_ERROR(__FILE__, __LINE__,
-				    "Can't create IOCP thread: %s", strbuf);
-		}
+		isc_thread_create(SocketIoThread, manager,
+				  &manager->hIOCPThreads[i]);
 	}
 }