diff --git a/util.c b/util.c
index 51edc3ce..2fa4938d 100644
--- a/util.c
+++ b/util.c
@@ -62,10 +62,10 @@ static void keep_sockalive(SOCKETTYPE fd)
 	ioctlsocket(fd, FIONBIO, &flags);
 #endif
 
-	setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (const void *)&tcp_one, sizeof(tcp_one));
+	setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (const char *)&tcp_one, sizeof(tcp_one));
 	if (!opt_delaynet)
 #ifndef __linux
-		setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (const void *)&tcp_one, sizeof(tcp_one));
+		setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (const char *)&tcp_one, sizeof(tcp_one));
 #else /* __linux */
 		setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&tcp_one, sizeof(tcp_one));
 	setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &tcp_one, sizeof(tcp_one));
@@ -120,7 +120,7 @@ static void databuf_free(struct data_buffer *db)
 static size_t all_data_cb(const void *ptr, size_t size, size_t nmemb,
 			  void *user_data)
 {
-	struct data_buffer *db = user_data;
+	struct data_buffer *db = (struct data_buffer *)user_data;
 	size_t len = size * nmemb;
 	size_t oldlen, newlen;
 	void *newmem;
@@ -135,8 +135,8 @@ static size_t all_data_cb(const void *ptr, size_t size, size_t nmemb,
 
 	db->buf = newmem;
 	db->len = newlen;
-	memcpy(db->buf + oldlen, ptr, len);
-	memcpy(db->buf + newlen, &zero, 1);	/* null terminate */
+	memcpy((uint8_t*)db->buf + oldlen, ptr, len);
+	memcpy((uint8_t*)db->buf + newlen, &zero, 1);	/* null terminate */
 
 	return len;
 }
@@ -144,7 +144,7 @@ static size_t all_data_cb(const void *ptr, size_t size, size_t nmemb,
 static size_t upload_data_cb(void *ptr, size_t size, size_t nmemb,
 			     void *user_data)
 {
-	struct upload_buffer *ub = user_data;
+	struct upload_buffer *ub = (struct upload_buffer *)user_data;
 	unsigned int len = size * nmemb;
 
 	if (len > ub->len)
@@ -152,7 +152,7 @@ static size_t upload_data_cb(void *ptr, size_t size, size_t nmemb,
 
 	if (len) {
 		memcpy(ptr, ub->buf, len);
-		ub->buf += len;
+		ub->buf = (uint8_t*)ub->buf + len;
 		ub->len -= len;
 	}
 
@@ -161,26 +161,26 @@ static size_t upload_data_cb(void *ptr, size_t size, size_t nmemb,
 
 static size_t resp_hdr_cb(void *ptr, size_t size, size_t nmemb, void *user_data)
 {
-	struct header_info *hi = user_data;
+	struct header_info *hi = (struct header_info *)user_data;
 	size_t remlen, slen, ptrlen = size * nmemb;
 	char *rem, *val = NULL, *key = NULL;
 	void *tmp;
 
-	val = calloc(1, ptrlen);
-	key = calloc(1, ptrlen);
+	val = (char *)calloc(1, ptrlen);
+	key = (char *)calloc(1, ptrlen);
 	if (!key || !val)
 		goto out;
 
 	tmp = memchr(ptr, ':', ptrlen);
 	if (!tmp || (tmp == ptr))	/* skip empty keys / blanks */
 		goto out;
-	slen = tmp - ptr;
+	slen = (uint8_t*)tmp - (uint8_t*)ptr;
 	if ((slen + 1) == ptrlen)	/* skip key w/ no value */
 		goto out;
 	memcpy(key, ptr, slen);		/* store & nul term key */
 	key[slen] = 0;
 
-	rem = ptr + slen + 1;		/* trim value's leading whitespace */
+	rem = (char*)ptr + slen + 1;	/* trim value's leading whitespace */
 	remlen = ptrlen - slen - 1;
 	while ((remlen > 0) && (isspace(*rem))) {
 		remlen--;
@@ -456,7 +456,7 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 	pool->sgminer_pool_stats.canroll = hi.canroll;
 	pool->sgminer_pool_stats.hadexpire = hi.hadexpire;
 
-	val = JSON_LOADS(all_data.buf, &err);
+	val = JSON_LOADS((const char *)all_data.buf, &err);
 	if (!val) {
 		applog(LOG_INFO, "JSON decode failed(%d): %s", err.line, err.text);
 
@@ -539,7 +539,7 @@ static struct {
 	{ "socks5:",	PROXY_SOCKS5 },
 	{ "socks4a:",	PROXY_SOCKS4A },
 	{ "socks5h:",	PROXY_SOCKS5H },
-	{ NULL,	0 }
+	{ NULL,	(proxytypes_t)NULL }
 };
 
 const char *proxytype(proxytypes_t proxytype)
@@ -568,7 +568,7 @@ char *get_proxy(char *url, struct pool *pool)
 
 			*split = '\0';
 			len = split - url;
-			pool->rpc_proxy = malloc(1 + len - plen);
+			pool->rpc_proxy = (char *)malloc(1 + len - plen);
 			if (!(pool->rpc_proxy))
 				quithere(1, "Failed to malloc rpc_proxy");
 
@@ -606,7 +606,7 @@ char *bin2hex(const unsigned char *p, size_t len)
 	slen = len * 2 + 1;
 	if (slen % 4)
 		slen += 4 - (slen % 4);
-	s = calloc(slen, 1);
+	s = (char *)calloc(slen, 1);
 	if (unlikely(!s))
 		quithere(1, "Failed to calloc");
 
@@ -712,7 +712,7 @@ struct thread_q *tq_new(void)
 {
 	struct thread_q *tq;
 
-	tq = calloc(1, sizeof(*tq));
+	tq = (struct thread_q *)calloc(1, sizeof(*tq));
 	if (!tq)
 		return NULL;
 
@@ -765,7 +765,7 @@ bool tq_push(struct thread_q *tq, void *data)
 	struct tq_ent *ent;
 	bool rc = true;
 
-	ent = calloc(1, sizeof(*ent));
+	ent = (struct tq_ent *)calloc(1, sizeof(*ent));
 	if (!ent)
 		return false;
 
@@ -1368,20 +1368,20 @@ static void clear_sock(struct pool *pool)
  * and zeroing the new memory */
 static void recalloc_sock(struct pool *pool, size_t len)
 {
-	size_t old, new;
+	size_t old, newlen;
 
 	old = strlen(pool->sockbuf);
-	new = old + len + 1;
-	if (new < pool->sockbuf_size)
+	newlen = old + len + 1;
+	if (newlen < pool->sockbuf_size)
 		return;
-	new = new + (RBUFSIZE - (new % RBUFSIZE));
+	newlen = newlen + (RBUFSIZE - (newlen % RBUFSIZE));
 	// Avoid potentially recursive locking
 	// applog(LOG_DEBUG, "Recallocing pool sockbuf to %d", new);
-	pool->sockbuf = realloc(pool->sockbuf, new);
+	pool->sockbuf = (char *)realloc(pool->sockbuf, newlen);
 	if (!pool->sockbuf)
 		quithere(1, "Failed to realloc pool sockbuf");
-	memset(pool->sockbuf + old, 0, new - old);
-	pool->sockbuf_size = new;
+	memset(pool->sockbuf + old, 0, newlen - old);
+	pool->sockbuf_size = newlen;
 }
 
 /* Peeks at a socket to find the first end of line and then reads just that
@@ -1552,12 +1552,12 @@ static bool parse_notify(struct pool *pool, json_t *val)
 	for (i = 0; i < pool->swork.merkles; i++)
 		free(pool->swork.merkle_bin[i]);
 	if (merkles) {
-		pool->swork.merkle_bin = realloc(pool->swork.merkle_bin,
+		pool->swork.merkle_bin = (unsigned char **)realloc(pool->swork.merkle_bin,
 						 sizeof(char *) * merkles + 1);
 		for (i = 0; i < merkles; i++) {
 			char *merkle = json_array_string(arr, i);
 
-			pool->swork.merkle_bin[i] = malloc(32);
+			pool->swork.merkle_bin[i] = (unsigned char *)malloc(32);
 			if (unlikely(!pool->swork.merkle_bin[i]))
 				quit(1, "Failed to malloc pool swork merkle_bin");
 			hex2bin(pool->swork.merkle_bin[i], merkle, 32);
@@ -1578,7 +1578,7 @@ static bool parse_notify(struct pool *pool, json_t *val)
 	pool->merkle_offset /= 2;
 	pool->swork.header_len = pool->swork.header_len * 2 + 1;
 	align_len(&pool->swork.header_len);
-	header = alloca(pool->swork.header_len);
+	header = (char *)alloca(pool->swork.header_len);
 	snprintf(header, pool->swork.header_len,
 		"%s%s%s%s%s%s%s",
 		pool->swork.bbversion,
@@ -1591,17 +1591,17 @@ static bool parse_notify(struct pool *pool, json_t *val)
 	if (unlikely(!hex2bin(pool->header_bin, header, 128)))
 		quit(1, "Failed to convert header to header_bin in parse_notify");
 
-	cb1 = calloc(cb1_len, 1);
+	cb1 = (unsigned char *)calloc(cb1_len, 1);
 	if (unlikely(!cb1))
 		quithere(1, "Failed to calloc cb1 in parse_notify");
 	hex2bin(cb1, coinbase1, cb1_len);
-	cb2 = calloc(cb2_len, 1);
+	cb2 = (unsigned char *)calloc(cb2_len, 1);
 	if (unlikely(!cb2))
 		quithere(1, "Failed to calloc cb2 in parse_notify");
 	hex2bin(cb2, coinbase2, cb2_len);
 	free(pool->coinbase);
 	align_len(&alloc_len);
-	pool->coinbase = calloc(alloc_len, 1);
+	pool->coinbase = (unsigned char *)calloc(alloc_len, 1);
 	if (unlikely(!pool->coinbase))
 		quit(1, "Failed to calloc pool coinbase in parse_notify");
 	memcpy(pool->coinbase, cb1, cb1_len);
@@ -2159,7 +2159,7 @@ static bool setup_stratum_socket(struct pool *pool)
 				int err, n;
 
 				len = sizeof(err);
-				n = getsockopt(sockd, SOL_SOCKET, SO_ERROR, (void *)&err, &len);
+				n = getsockopt(sockd, SOL_SOCKET, SO_ERROR, (char *)&err, &len);
 				if (!n && !err) {
 					applog(LOG_DEBUG, "Succeeded delayed connect");
 					block_socket(sockd);
@@ -2215,7 +2215,7 @@ static bool setup_stratum_socket(struct pool *pool)
 	}
 
 	if (!pool->sockbuf) {
-		pool->sockbuf = calloc(RBUFSIZE, 1);
+		pool->sockbuf = (char *)calloc(RBUFSIZE, 1);
 		if (!pool->sockbuf)
 			quithere(1, "Failed to calloc pool sockbuf");
 		pool->sockbuf_size = RBUFSIZE;
@@ -2358,7 +2358,7 @@ resend:
 	pool->nonce1 = nonce1;
 	pool->n1_len = strlen(nonce1) / 2;
 	free(pool->nonce1bin);
-	pool->nonce1bin = calloc(pool->n1_len, 1);
+	pool->nonce1bin = (unsigned char *)calloc(pool->n1_len, 1);
 	if (unlikely(!pool->nonce1bin))
 		quithere(1, "Failed to calloc pool->nonce1bin");
 	hex2bin(pool->nonce1bin, pool->nonce1, pool->n1_len);
@@ -2466,7 +2466,7 @@ void *realloc_strcat(char *ptr, char *s)
 	len += old + 1;
 	align_len(&len);
 
-	ret = malloc(len);
+	ret = (char *)malloc(len);
 	if (unlikely(!ret))
 		quithere(1, "Failed to malloc");
 
@@ -2492,7 +2492,7 @@ void *str_text(char *ptr)
 
 	uptr = (unsigned char *)ptr;
 
-	ret = txt = malloc(strlen(ptr)*4+5); // Guaranteed >= needed
+	ret = txt = (char *)malloc(strlen(ptr) * 4 + 5); // Guaranteed >= needed
 	if (unlikely(!txt))
 		quithere(1, "Failed to malloc txt");
 
@@ -2696,11 +2696,17 @@ bool cg_completion_timeout(void *fn, void *fnarg, int timeout)
 	pthread_t pthread;
 	bool ret = false;
 
-	cgc = malloc(sizeof(struct cg_completion));
+	cgc = (struct cg_completion *)malloc(sizeof(struct cg_completion));
 	if (unlikely(!cgc))
 		return ret;
 	cgsem_init(&cgc->cgsem);
+
+#ifdef _MSC_VER
+	cgc->fn = (void(__cdecl *)(void *))fn;
+#else
 	cgc->fn = fn;
+#endif
+
 	cgc->fnarg = fnarg;
 
 	pthread_create(&pthread, NULL, completion_thread, (void *)cgc);