diff --git a/handlers/deploy.go b/handlers/deploy.go
index 487ae20d2f..ecbe34f44c 100644
--- a/handlers/deploy.go
+++ b/handlers/deploy.go
@@ -268,7 +268,9 @@ func buildAnnotations(request types.FunctionDeployment) map[string]string {
 		annotations = map[string]string{}
 	}
 
-	annotations["prometheus.io.scrape"] = "false"
+	if _, ok := annotations["prometheus.io.scrape"]; !ok {
+		annotations["prometheus.io.scrape"] = "false"
+	}
 	return annotations
 }
 
diff --git a/handlers/deploy_test.go b/handlers/deploy_test.go
index fc98d3454b..e051359958 100644
--- a/handlers/deploy_test.go
+++ b/handlers/deploy_test.go
@@ -32,6 +32,25 @@ func Test_buildAnnotations_Empty_In_CreateRequest(t *testing.T) {
 	}
 }
 
+func Test_buildAnnotations_Premetheus_NotOverridden(t *testing.T) {
+	request := types.FunctionDeployment{Annotations: &map[string]string{"prometheus.io.scrape": "true"}}
+
+	annotations := buildAnnotations(request)
+
+	if len(annotations) != 1 {
+		t.Errorf("want: %d annotations got: %d", 1, len(annotations))
+	}
+
+	v, ok := annotations["prometheus.io.scrape"]
+	if !ok {
+		t.Errorf("missing prometheus.io.scrape key")
+	}
+
+	if v != "true" {
+		t.Errorf("want: %s for annotation prometheus.io.scrape got: %s", "true", v)
+	}
+}
+
 func Test_buildAnnotations_From_CreateRequest(t *testing.T) {
 	request := types.FunctionDeployment{
 		Annotations: &map[string]string{
diff --git a/pkg/controller/deployment_test.go b/pkg/controller/deployment_test.go
index 6c0cae6217..cc4ca78fac 100644
--- a/pkg/controller/deployment_test.go
+++ b/pkg/controller/deployment_test.go
@@ -72,3 +72,42 @@ func Test_newDeployment(t *testing.T) {
 		t.Fail()
 	}
 }
+
+func Test_newDeployment_PrometheusScrape_NotOverridden(t *testing.T) {
+	function := &faasv1.Function{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "kubesec",
+		},
+		Spec: faasv1.FunctionSpec{
+			Name:  "kubesec",
+			Image: "docker.io/kubesec/kubesec",
+			Annotations: &map[string]string{
+				"prometheus.io.scrape": "true",
+			},
+		},
+	}
+
+	factory := NewFunctionFactory(fake.NewSimpleClientset(),
+		k8s.DeploymentConfig{
+			HTTPProbe:      false,
+			SetNonRootUser: true,
+			LivenessProbe: &k8s.ProbeConfig{
+				PeriodSeconds:       1,
+				TimeoutSeconds:      3,
+				InitialDelaySeconds: 0,
+			},
+			ReadinessProbe: &k8s.ProbeConfig{
+				PeriodSeconds:       1,
+				TimeoutSeconds:      3,
+				InitialDelaySeconds: 0,
+			},
+		})
+
+	secrets := map[string]*corev1.Secret{}
+
+	deployment := newDeployment(function, nil, secrets, factory)
+
+	if deployment.Spec.Template.Annotations["prometheus.io.scrape"] != "true" {
+		t.Errorf("Annotation prometheus.io.scrape should be %s, was: %s", "true", deployment.Spec.Template.Annotations["prometheus.io.scrape"])
+	}
+}