diff --git a/lib/tester/index.ts b/lib/tester/index.ts
index 0180fc7..7a7e45f 100644
--- a/lib/tester/index.ts
+++ b/lib/tester/index.ts
@@ -197,7 +197,7 @@ export default class Tester implements ITester {
           source: this.me,
           destination: agent,
           timings: result.timings,
-          result: 'pass'
+          result: result.statusCode === 200 ? 'pass' : 'fail'
         }
         this.metrics.handleTCPTestResult(mappedResult)
         return mappedResult
diff --git a/test/tester.test.ts b/test/tester.test.ts
index 0ca944a..3b58752 100644
--- a/test/tester.test.ts
+++ b/test/tester.test.ts
@@ -58,7 +58,7 @@ describe('Tester', () => {
     should(result[0].result).eql('pass')
   })
 
-  it('should should capture a failed ping as an error', async () => {
+  it('should should capture a failed ping as an fail', async () => {
     const udpClient = td.object<IUDPClient>()
     const udpPingResult = td.object<IUDPPingResult>()
     udpPingResult.success = true
@@ -92,4 +92,32 @@ describe('Tester', () => {
     const result = await sut.runTCPTests([agent])
     should(result[0].result).eql('pass')
   })
+
+  it('should capture a 5xx code as a fail', async () => {
+    td.when(
+      got('http://127.0.0.1:8080/readiness', { timeout: 500 })
+    ).thenResolve({ statusCode: 500 })
+
+    const agent = td.object<IAgent>()
+    agent.ip = '127.0.0.1'
+    agent.name = 'local'
+    agent.nodeName = 'some-node'
+    agent.zone = 'some-zone'
+    const result = await sut.runTCPTests([agent])
+    should(result[0].result).eql('fail')
+  })
+
+  it('should capture a failed tcp test as a fail', async () => {
+    td.when(
+      got('http://127.0.0.1:8080/readiness', { timeout: 500 })
+    ).thenReject(new Error('boom'))
+
+    const agent = td.object<IAgent>()
+    agent.ip = '127.0.0.1'
+    agent.name = 'local'
+    agent.nodeName = 'some-node'
+    agent.zone = 'some-zone'
+    const result = await sut.runTCPTests([agent])
+    should(result[0].result).eql('fail')
+  })
 })