--- mod_auth_kerb-5.1/src/mod_auth_kerb.c.username
+++ mod_auth_kerb-5.1/src/mod_auth_kerb.c
@@ -1339,7 +1339,7 @@
   }
 
   MK_AUTH_TYPE = MECH_NEGOTIATE;
-  MK_USER = apr_pstrdup(r->pool, output_token.value);
+  MK_USER = apr_pstrdup(r->connection->pool, output_token.value);
 
 #ifndef APXS1
   {