diff --git a/modules/ldap/util_ldap.c b/modules/ldap/util_ldap.c
index 9a137a3263..6b733a005f 100644
--- a/modules/ldap/util_ldap.c
+++ b/modules/ldap/util_ldap.c
@@ -2541,7 +2541,7 @@ static const char *util_ldap_set_op_timeout(cmd_parms *cmd,
 
     ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, cmd->server,
                  "[%" APR_PID_T_FMT "] ldap connection: Setting op timeout "
-                 "to %d seconds.", getpid(), timeout);
+                 "to %ld seconds.", getpid(), timeout);
 
 #ifndef LDAP_OPT_TIMEOUT