--- plugins/thunar-sbr/thunar-sbr-case-renamer.c	2008-09-28 12:01:31.000000000 +0200
+++ plugins/thunar-sbr/thunar-sbr-case-renamer.c	2008-09-28 12:01:24.000000000 +0200
@@ -204,7 +204,7 @@
         {
           upper = TRUE;
         }
-      else if (upper)
+      else if (g_unichar_isalpha(c) && upper)
         {
           c = g_unichar_toupper (c);
           upper = FALSE;