diff --git a/core/service_test.go b/core/service_test.go
index 893a2788..6d2596d2 100644
--- a/core/service_test.go
+++ b/core/service_test.go
@@ -96,9 +96,6 @@ func TestService_GetAlertsTriggered(t *testing.T) {
 		URL:        "https://twinnation.org/health",
 		Conditions: []*Condition{&condition},
 		Alerts:     []*Alert{{Type: PagerDutyAlert, Enabled: true}},
-		Headers: map[string]string{
-			"Host": "twinnation.org",
-		},
 	}
 	service.ValidateAndSetDefaults()
 	if service.NumberOfFailuresInARow != 0 {
@@ -116,6 +113,37 @@ func TestService_GetAlertsTriggered(t *testing.T) {
 	}
 }
 
+func TestService_buildHTTPRequest(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	service := Service{
+		Name:       "TwiNNatioN",
+		URL:        "https://twinnation.org/health",
+		Conditions: []*Condition{&condition},
+	}
+	service.ValidateAndSetDefaults()
+	request := service.buildHTTPRequest()
+	if request.Host != "twinnation.org" {
+		t.Error("request's Host should've been twinnation.org, but was", request.Host)
+	}
+}
+
+func TestService_buildHTTPRequestWithHostHeader(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	service := Service{
+		Name:       "TwiNNatioN",
+		URL:        "https://twinnation.org/health",
+		Conditions: []*Condition{&condition},
+		Headers: map[string]string{
+			"Host": "example.com",
+		},
+	}
+	service.ValidateAndSetDefaults()
+	request := service.buildHTTPRequest()
+	if request.Host != "example.com" {
+		t.Error("request's Host should've been example.org, but was", request.Host)
+	}
+}
+
 func TestIntegrationEvaluateHealth(t *testing.T) {
 	condition := Condition("[STATUS] == 200")
 	service := Service{