diff --git a/server/monitor-types/dns.js b/server/monitor-types/dns.js
index 1a35a99d9..d038b6805 100644
--- a/server/monitor-types/dns.js
+++ b/server/monitor-types/dns.js
@@ -4,7 +4,7 @@ const dayjs = require("dayjs");
 const { dnsResolve } = require("../util-server");
 const { R } = require("redbean-node");
 
-export class DnsMonitorType extends MonitorType {
+class DnsMonitorType extends MonitorType {
     name = "dns";
 
     /**
@@ -49,3 +49,7 @@ export class DnsMonitorType extends MonitorType {
         heartbeat.status = UP;
     }
 }
+
+module.exports = {
+    DnsMonitorType,
+};
diff --git a/server/monitor-types/mongodb.js b/server/monitor-types/mongodb.js
index 37ad3b460..73747db9c 100644
--- a/server/monitor-types/mongodb.js
+++ b/server/monitor-types/mongodb.js
@@ -3,7 +3,7 @@ const { UP } = require("../../src/util");
 const { MongoClient } = require("mongodb");
 const jsonata = require("jsonata");
 
-export class MongodbMonitorType extends MonitorType {
+class MongodbMonitorType extends MonitorType {
     name = "mongodb";
 
     /**
@@ -57,3 +57,7 @@ export class MongodbMonitorType extends MonitorType {
         return result;
     }
 }
+
+module.exports = {
+    MongodbMonitorType,
+};
diff --git a/server/monitor-types/monitor-type.js b/server/monitor-types/monitor-type.js
index c837b63a1..8290bdd76 100644
--- a/server/monitor-types/monitor-type.js
+++ b/server/monitor-types/monitor-type.js
@@ -1,4 +1,4 @@
-export class MonitorType {
+class MonitorType {
     name = undefined;
 
     /**
@@ -12,3 +12,7 @@ export class MonitorType {
         throw new Error("You need to override check()");
     }
 }
+
+module.exports = {
+    MonitorType,
+};
diff --git a/server/monitor-types/mqtt.js b/server/monitor-types/mqtt.js
index 2a4c1296c..ad734ce8e 100644
--- a/server/monitor-types/mqtt.js
+++ b/server/monitor-types/mqtt.js
@@ -3,7 +3,7 @@ const { log, UP } = require("../../src/util");
 const mqtt = require("mqtt");
 const jsonata = require("jsonata");
 
-export class MqttMonitorType extends MonitorType {
+class MqttMonitorType extends MonitorType {
     name = "mqtt";
 
     /**
diff --git a/server/monitor-types/real-browser-monitor-type.js b/server/monitor-types/real-browser-monitor-type.js
index 84b06d939..f1219af18 100644
--- a/server/monitor-types/real-browser-monitor-type.js
+++ b/server/monitor-types/real-browser-monitor-type.js
@@ -228,7 +228,8 @@ async function testRemoteBrowser(remoteBrowserURL) {
         throw new Error(e.message);
     }
 }
-export class RealBrowserMonitorType extends MonitorType {
+class RealBrowserMonitorType extends MonitorType {
+
     name = "real-browser";
 
     /**
@@ -265,6 +266,7 @@ export class RealBrowserMonitorType extends MonitorType {
 }
 
 module.exports = {
+    RealBrowserMonitorType,
     testChrome,
     resetChrome,
     testRemoteBrowser,
diff --git a/server/monitor-types/tailscale-ping.js b/server/monitor-types/tailscale-ping.js
index 308ffa436..8537651cd 100644
--- a/server/monitor-types/tailscale-ping.js
+++ b/server/monitor-types/tailscale-ping.js
@@ -2,7 +2,7 @@ const { MonitorType } = require("./monitor-type");
 const { UP } = require("../../src/util");
 const childProcessAsync = require("promisify-child-process");
 
-export class TailscalePing extends MonitorType {
+class TailscalePing extends MonitorType {
     name = "tailscale-ping";
 
     /**
@@ -71,3 +71,7 @@ export class TailscalePing extends MonitorType {
         }
     }
 }
+
+module.exports = {
+    TailscalePing,
+};