diff --git "a/D:\\_Sandbox\\curl\\libssh2-x64\\src\\session.c.orig" "b/D:\\_Sandbox\\curl\\libssh2-x64\\src\\session.c"
index e439acd..476a497 100644
--- "a/src/session.c"
+++ "b/src/session.c"
@@ -58,6 +58,8 @@
 #include "mac.h"
 #include "misc.h"
 
+#define DIFFTIME(_b,_a) ((double)((_b) - (_a)))
+
 /* libssh2_default_alloc
  */
 static
@@ -610,7 +612,7 @@ int _libssh2_wait_socket(LIBSSH2_SESSION *session, time_t start_time)
         (seconds_to_next == 0 ||
          ms_to_next > session->api_timeout)) {
         time_t now = time(NULL);
-        elapsed_ms = (long)(1000*difftime(now, start_time));
+        elapsed_ms = (long)(1000*DIFFTIME(now, start_time));
         if(elapsed_ms > session->api_timeout) {
             return _libssh2_error(session, LIBSSH2_ERROR_TIMEOUT,
                                   "API timeout expired");