diff --git a/xbindkeys.c b/xbindkeys.c
index 2f6ad5a..503b575 100644
--- a/xbindkeys.c
+++ b/xbindkeys.c
@@ -210,6 +210,8 @@ adjust_display (XAnyEvent * xany)
 
   XGetWindowAttributes (xany->display, xany->window,  &attr);
 
+  printf("DEBUG: envstr=%s  string=%s\n", envstr, DisplayString(xany->display));
+
   if (verbose)
     printf ("got screen %d for window %x\n", XScreenNumberOfScreen(attr.screen), (unsigned int)xany->window );