diff --git a/Source/CTest/Curl/Testing/curltest.c b/Source/CTest/Curl/Testing/curltest.c
index 5a63ef327..ea54c0832 100644
--- a/Source/CTest/Curl/Testing/curltest.c
+++ b/Source/CTest/Curl/Testing/curltest.c
@@ -1,3 +1,4 @@
+struct _RPC_ASYNC_STATE;
 #include "curl/curl.h"
 #include <stdlib.h>
 
diff --git a/Source/CTest/Curl/getpass.c b/Source/CTest/Curl/getpass.c
index d0f4eda09..ec850d8b9 100644
--- a/Source/CTest/Curl/getpass.c
+++ b/Source/CTest/Curl/getpass.c
@@ -200,7 +200,7 @@ char *getpass_r(const char *prompt, char *buffer, int buflen)
   printf("%s", prompt);
  
   for(i=0; i<buflen; i++) {
-    buffer[i] = getch();
+    buffer[i] = (char)getch();
     if ( buffer[i] == '\r' ) {
       buffer[i] = 0;
       break;
diff --git a/Source/CTest/Curl/netrc.c b/Source/CTest/Curl/netrc.c
index a2d67082a..a8f0c013e 100644
--- a/Source/CTest/Curl/netrc.c
+++ b/Source/CTest/Curl/netrc.c
@@ -181,7 +181,7 @@ int Curl_parsenetrc(char *host,
           /* we are now parsing sub-keywords concerning "our" host */
           if(state_login) {
             if (specific_login) {
-              state_our_login = strequal(login, tok);
+              state_our_login = (char)strequal(login, tok);
             }else{
               strncpy(login, tok, LOGINSIZE-1);
 #ifdef _NETRC_DEBUG
diff --git a/Source/CTest/Curl/telnet.c b/Source/CTest/Curl/telnet.c
index 42a178090..7772d5ebd 100644
--- a/Source/CTest/Curl/telnet.c
+++ b/Source/CTest/Curl/telnet.c
@@ -36,9 +36,15 @@
 #include <errno.h>
 
 #if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
+#ifdef _MSC_VER
+#pragma warning (push,1)
+#endif
 #include <winsock2.h>
 #include <time.h>
 #include <io.h>
+#ifdef _MSC_VER
+#pragma warning (pop)
+#endif
 #else
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
@@ -260,10 +266,10 @@ static void send_negotiation(struct connectdata *conn, int cmd, int option)
    unsigned char buf[3];
 
    buf[0] = IAC;
-   buf[1] = cmd;
-   buf[2] = option;
+   buf[1] = (unsigned char)cmd;
+   buf[2] = (unsigned char)option;
    
-   swrite(conn->firstsocket, buf, 3);
+   swrite(conn->firstsocket, (char*)buf, 3);
    
    printoption(conn->data, "SENT", cmd, option);
 }
@@ -821,13 +827,13 @@ static void suboption(struct connectdata *conn)
   struct TELNET *tn = (struct TELNET *)conn->proto.telnet;
 
   printsub(data, '<', (unsigned char *)tn->subbuffer, SB_LEN(tn)+2);
-  switch (subchar = SB_GET(tn)) {
+  switch (subchar = (unsigned char)SB_GET(tn)) {
     case TELOPT_TTYPE:
       len = strlen(tn->subopt_ttype) + 4 + 2;
       snprintf((char *)temp, sizeof(temp),
                "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE,
                TELQUAL_IS, tn->subopt_ttype, IAC, SE);
-      swrite(conn->firstsocket, temp, len);
+      swrite(conn->firstsocket, (char*)temp, len);
       printsub(data, '>', &temp[2], len-2);
       break;
     case TELOPT_XDISPLOC:
@@ -835,7 +841,7 @@ static void suboption(struct connectdata *conn)
       snprintf((char *)temp, sizeof(temp),
                "%c%c%c%c%s%c%c", IAC, SB, TELOPT_XDISPLOC,
                TELQUAL_IS, tn->subopt_xdisploc, IAC, SE);
-      swrite(conn->firstsocket, temp, len);
+      swrite(conn->firstsocket, (char*)temp, len);
       printsub(data, '>', &temp[2], len-2);
       break;
     case TELOPT_NEW_ENVIRON:
@@ -857,7 +863,7 @@ static void suboption(struct connectdata *conn)
       snprintf((char *)&temp[len], sizeof(temp) - len,
                "%c%c", IAC, SE);
       len += 2;
-      swrite(conn->firstsocket, temp, len);
+      swrite(conn->firstsocket, (char*)temp, len);
       printsub(data, '>', &temp[2], len-2);
       break;
   }
@@ -1051,6 +1057,7 @@ CURLcode Curl_telnet(struct connectdata *conn)
   ssize_t nread;
   struct TELNET *tn;
   struct timeval now;           /* current time */
+  (void) now;
 
   code = init_telnet(conn);
   if(code)
@@ -1095,7 +1102,7 @@ CURLcode Curl_telnet(struct connectdata *conn)
         ssize_t bytes_written;
         char *buffer = buf;
               
-        if(!ReadFile(stdin_handle, buf, 255, &nread, NULL)) {
+        if(!ReadFile(stdin_handle, buf, 255, &(DWORD)nread, NULL)) {
           keepon = FALSE;
           break;
         }
diff --git a/Source/CTest/Curl/transfer.c b/Source/CTest/Curl/transfer.c
index 75cdc6952..df253b1f8 100644
--- a/Source/CTest/Curl/transfer.c
+++ b/Source/CTest/Curl/transfer.c
@@ -1095,7 +1095,7 @@ CURLcode Curl_readwrite(struct connectdata *conn,
   }
 
   /* Now update the "done" boolean we return */
-  *done = !k->keepon;
+  *done = (bool)!k->keepon;
 
   return CURLE_OK;
 }
@@ -1310,6 +1310,7 @@ CURLcode Curl_pretransfer(struct SessionHandle *data)
 
 CURLcode Curl_posttransfer(struct SessionHandle *data)
 {
+  (void)data;
 #if defined(HAVE_SIGNAL) && defined(SIGPIPE)
   /* restore the signal handler for SIGPIPE before we get back */
   if(!data->set.no_signal)