diff --git a/scd/command.c b/scd/command.c
index 358459364..e771a745b 100644
--- a/scd/command.c
+++ b/scd/command.c
@@ -2137,7 +2137,8 @@ send_status_info (ctrl_t ctrl, const char *keyword, ...)
         }
       for ( ; valuelen && n < DIM (buf)-2; n++, valuelen--, value++)
         {
-          if (*value < ' ' || *value == '+')
+          if (*value == '+' || *value == '\"' || *value == '%'
+              || *value < ' ')
             {
               sprintf (p, "%%%02X", *value);
               p += 3;