diff --git a/agent/metrics_test.go b/agent/metrics_test.go
index 41013b3c70..113699fa0e 100644
--- a/agent/metrics_test.go
+++ b/agent/metrics_test.go
@@ -35,9 +35,8 @@ func recordPromMetrics(t *testing.T, a *TestAgent, respRec *httptest.ResponseRec
 	req, err := http.NewRequest("GET", "/v1/agent/metrics?format=prometheus", nil)
 	require.NoError(t, err, "Failed to generate new http request.")
 
-	_, err = a.srv.AgentMetrics(respRec, req)
-	require.NoError(t, err, "Failed to serve agent metrics")
-
+	a.srv.h.ServeHTTP(respRec, req)
+	require.Equalf(t, 200, respRec.Code, "expected 200, got %d, body: %s", respRec.Code, respRec.Body.String())
 }
 
 func assertMetricExists(t *testing.T, respRec *httptest.ResponseRecorder, metric string) {