Index: src/fs/fs_uri.c
===================================================================
--- src/fs/fs_uri.c	(revision 19758)
+++ src/fs/fs_uri.c	(working copy)
@@ -1404,8 +1404,12 @@
 
   if (uri->type == ksk)
   {
-    for (i = uri->data.ksk.keywordCount - 1; i >= 0; i--)
+    for (i = uri->data.ksk.keywordCount - 1; ; i--)
+    {
       GNUNET_assert (uri->data.ksk.keywords[i] != NULL);
+      if (i == 0)
+        break;
+    }
   }
 #endif
   return uri->type == ksk;