diff --git a/sm/certdump.c b/sm/certdump.c
index c177cabcf..57e8112fd 100644
--- a/sm/certdump.c
+++ b/sm/certdump.c
@@ -427,7 +427,7 @@ parse_dn_part (struct dn_array_s *array, const unsigned char *string)
     { /* hexstring */
       string++;
       for (s=string; hexdigitp (s); s++)
-        s++;
+        ;
       n = s - string;
       if (!n || (n & 1))
         return NULL; /* Empty or odd number of digits. */