diff --git a/modules/csync_owncloud.c b/modules/csync_owncloud.c
index 0726c9071..43d86192c 100644
--- a/modules/csync_owncloud.c
+++ b/modules/csync_owncloud.c
@@ -964,6 +964,15 @@ static csync_vio_method_handle_t *owncloud_open(const char *durl,
 	}
 #else
         writeCtx->tmpFileName = c_strdup( "/tmp/csync.XXXXXX" );
+#ifdef _WIN32
+	if( c_tmpname( writeCtx->tmpFileName ) == 0 ) {
+          _fmode = _O_BINARY;
+
+	   writeCtx->fd = open( writeCtx->tmpFileName, O_RDWR | O_CREAT | O_EXCL, 0600 );
+	} else {
+	   writeCtx->fd = -1;
+	}
+#else
         writeCtx->fd = mkstemp( writeCtx->tmpFileName );
 #endif
         DEBUG_WEBDAV("opening temp directory %s: %d", writeCtx->tmpFileName, writeCtx->fd );