--- a/xsnap.c
+++ b/xsnap.c
@@ -2254,7 +2254,7 @@
 	if (op_mode == 0)
 	    exitXsnap (NULL, NULL, snap_pixmap, copy_gc);
 
-	if (!root_name)
+	if (*root_name == '\0')
 		strcpy(output_name, "(stdout)");
 
 	if (op_mode == 2) {