diff --git a/src/tool_urlglob.c b/src/tool_urlglob.c
index babae0416a..e9007b2b4e 100644
--- a/src/tool_urlglob.c
+++ b/src/tool_urlglob.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -603,7 +603,7 @@ CURLcode glob_match_url(char **result, char *filename, URLGlob *glob)
   char *target;
   size_t allocsize;
   char numbuf[18];
-  char *appendthis = NULL;
+  char *appendthis = (char *)"";
   size_t appendlen = 0;
   size_t stringlen = 0;