diff --git a/include/polarssl/net.h b/include/polarssl/net.h
index 5f389f8..f5b3f42 100644
--- a/include/polarssl/net.h
+++ b/include/polarssl/net.h
@@ -35,6 +35,15 @@
 
 #include <string.h>
 
+#if defined(POLARSSL_HAVE_TIME)
+#if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
+#include <basetsd.h>
+typedef UINT32 uint32_t;
+#else
+#include <inttypes.h>
+#endif
+#endif /* POLARSSL_HAVE_TIME */
+
 #define POLARSSL_ERR_NET_SOCKET_FAILED                     -0x0042  /**< Failed to open a socket. */
 #define POLARSSL_ERR_NET_CONNECT_FAILED                    -0x0044  /**< The connection to the given server / port failed. */
 #define POLARSSL_ERR_NET_BIND_FAILED                       -0x0046  /**< Binding of the socket failed. */
@@ -178,7 +187,7 @@
  * \param ctx      Socket
  * \param buf      The buffer to write to
  * \param len      Maximum length of the buffer
- * \param timeout  Maximum number of seconds to wait for data
+ * \param timeout  Maximum number of milliseconds to wait for data
  *
  * \return         This function returns the number of bytes received,
  *                 or a non-zero error code:
@@ -191,7 +200,7 @@
  *                 requires a different strategy.
  */
 int net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
-                      unsigned char timeout );
+                      uint32_t timeout );
 #endif /* POLARSSL_HAVE_TIME */
 
 /**
diff --git a/include/polarssl/ssl.h b/include/polarssl/ssl.h
index 9ff1d4f..f3f3575 100644
--- a/include/polarssl/ssl.h
+++ b/include/polarssl/ssl.h
@@ -778,7 +778,7 @@
     void (*f_dbg)(void *, int, const char *);
     int (*f_send)(void *, const unsigned char *, size_t);
     int (*f_recv)(void *, unsigned char *, size_t);
-    int (*f_recv_timeout)(void *, unsigned char *, size_t, unsigned char);
+    int (*f_recv_timeout)(void *, unsigned char *, size_t, uint32_t);
     int (*f_get_cache)(void *, ssl_session *);
     int (*f_set_cache)(void *, const ssl_session *);
 
@@ -1194,8 +1194,8 @@
         void *p_bio,
         int (*f_send)(void *, const unsigned char *, size_t),
         int (*f_recv)(void *, unsigned char *, size_t),
-        int (*f_recv_timeout)(void *, unsigned char *, size_t, unsigned char),
-        unsigned char timeout );
+        int (*f_recv_timeout)(void *, unsigned char *, size_t, uint32_t),
+        uint32_t timeout );
 
 #if defined(POLARSSL_SSL_DTLS_HELLO_VERIFY)
 /**