Index: src/ftp.c
--- src/ftp.c.orig
+++ src/ftp.c
@@ -151,13 +151,9 @@ ftp_stor(CONN *C, URL U) 
 {
   size_t  len;
   char    *file;
-  size_t  id = pthread_self();
+  pthread_t  id = pthread_self();
   int     num = 2;
   char    **parts;
- 
-  if (id < 0.0) {
-    id = -id;
-  }
  
   len   = strlen(url_get_file(U))+17; 
   parts = split('.', url_get_file(U), &num);