diff --git a/src/main/cljc/dda/c4k_keycloak/common.cljc b/src/main/cljc/dda/c4k_keycloak/common.cljc
index 6048fcb..7beee60 100644
--- a/src/main/cljc/dda/c4k_keycloak/common.cljc
+++ b/src/main/cljc/dda/c4k_keycloak/common.cljc
@@ -10,7 +10,7 @@
 (defn fqdn-string?
   [input]
   (and (string? input)
-       (not (nil? (re-matches #"(?=^.{4,253}\.?$)(^((?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.)+[a-zA-Z]{2,63}\.?$)" input)))))
+       (some? (re-matches #"(?=^.{4,253}$)(^((?!-)[a-zA-Z0-9-]{0,62}[a-zA-Z0-9]\.)+[a-zA-Z]{2,63}$)" input))))
 
 (defn letsencrypt-issuer? 
   [input]