diff --git a/src/publisher/mqtt/util.ts b/src/publisher/mqtt/util.ts
index f97c847..b61114f 100644
--- a/src/publisher/mqtt/util.ts
+++ b/src/publisher/mqtt/util.ts
@@ -5,8 +5,8 @@ import slugify from 'slugify'
 
 export const slugifyName = (name: string): string => {
   return slugify(name, {
-    // We can't have "+" in MQTT topic names
-    remove: /[+]/,
+    // We can't have "+" and "/" in MQTT topic names
+    remove: /[+/]/,
     // Since the rest of the topic name is lower-case, just lower-case everything
     lower: true,
   })
diff --git a/tests/publisher/mqtt/util.test.ts b/tests/publisher/mqtt/util.test.ts
index 459198a..999d56d 100644
--- a/tests/publisher/mqtt/util.test.ts
+++ b/tests/publisher/mqtt/util.test.ts
@@ -3,6 +3,7 @@ import { createCharacteristicsSensorTopicName, createPowerSensorTopicName } from
 import { Circuit } from '../../../src/circuit'
 
 test('creates correct topic names', () => {
+  // Strips spaces
   const characteristics = {
     name: 'Some characteristic',
   } as unknown as Characteristics
@@ -10,10 +11,19 @@ test('creates correct topic names', () => {
   let topic = createCharacteristicsSensorTopicName(characteristics, 'voltage')
   expect(topic).toEqual('eachwatt/characteristic/some-characteristic/voltage')
 
-  const circuit = {
+  // Strips plus signs
+  let circuit = {
     name: 'Some circuit + with plus sign',
   } as unknown as Circuit
 
   topic = createPowerSensorTopicName(circuit, 'power')
   expect(topic).toEqual('eachwatt/circuit/some-circuit-with-plus-sign/power')
+
+  // Strips forward slashes
+  circuit = {
+    name: 'Some circuit / with a slash',
+  } as unknown as Circuit
+
+  topic = createPowerSensorTopicName(circuit, 'power')
+  expect(topic).toEqual('eachwatt/circuit/some-circuit-with-a-slash/power')
 })