Compiler warning fix
diff --git a/lib/transfer.c b/lib/transfer.c
index 25645c9..e136020 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -319,7 +319,7 @@
         int readrc;
 
         if (k->size != -1 && !k->header)
-          bytestoread = k->size - k->bytecount;
+          bytestoread = (size_t)(k->size - k->bytecount);
 
         /* receive data from the network! */
         readrc = Curl_read(conn, conn->sockfd, k->buf, bytestoread, &nread);
@@ -1133,7 +1133,8 @@
 
           if((-1 != k->maxdownload) &&
              (k->bytecount + nread >= k->maxdownload)) {
-            size_t excess = k->bytecount + nread - k->maxdownload;
+            size_t excess = (size_t)(k->bytecount + 
+                             (curl_off_t)nread - k->maxdownload);
 
             if (excess > 0) {
                 infof(data, "Rewinding stream by : %d bytes\n", excess);