--- modules/http/http_core.c.orig
+++ modules/http/http_core.c
@@ -47,12 +47,15 @@ static int ap_process_http_connection(co
 static const char *set_keep_alive_timeout(cmd_parms *cmd, void *dummy,
                                           const char *arg)
 {
+    apr_interval_time_t timeout;
     const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT);
     if (err != NULL) {
         return err;
     }
-
-    cmd->server->keep_alive_timeout = apr_time_from_sec(atoi(arg));
+    /* Stolen from mod_proxy.c */
+    if (ap_timeout_parameter_parse(arg, &timeout, "s") != APR_SUCCESS)
+        return "KeepAliveTimeout has wrong format";
+    cmd->server->keep_alive_timeout = timeout;
     return NULL;
 }