diff --git a/docs/gitbook/tutorials/istio-progressive-delivery.md b/docs/gitbook/tutorials/istio-progressive-delivery.md
index 9764c828..39b6df63 100644
--- a/docs/gitbook/tutorials/istio-progressive-delivery.md
+++ b/docs/gitbook/tutorials/istio-progressive-delivery.md
@@ -325,7 +325,7 @@ spec:
     # enable traffic shadowing 
     mirror: true
     # weight of the traffic mirrored to your canary (defaults to 100%)
-    mirrorWeight: 100.0
+    mirrorWeight: 100
     metrics:
     - name: request-success-rate
       thresholdRange:
diff --git a/docs/gitbook/usage/deployment-strategies.md b/docs/gitbook/usage/deployment-strategies.md
index bc70aafa..05cc4fd5 100644
--- a/docs/gitbook/usage/deployment-strategies.md
+++ b/docs/gitbook/usage/deployment-strategies.md
@@ -278,7 +278,7 @@ Istio example:
     # Traffic shadowing (compatible with Istio only)
     mirror: true
     # Weight of the traffic mirrored to your canary (defaults to 100%)
-    mirrorWeight: 100.0
+    mirrorWeight: 100
 ```
 
 Mirroring rollout steps for service mesh:
diff --git a/pkg/apis/flagger/v1beta1/canary.go b/pkg/apis/flagger/v1beta1/canary.go
index 7e33239b..dd9c891a 100644
--- a/pkg/apis/flagger/v1beta1/canary.go
+++ b/pkg/apis/flagger/v1beta1/canary.go
@@ -179,9 +179,9 @@ type CanaryAnalysis struct {
 	// +optional
 	Mirror bool `json:"mirror,omitempty"`
 
-	// Percentage of the traffic to be mirrored in the range of [0.0, 100.0].
+	// Percentage of the traffic to be mirrored in the range of [0, 100].
 	// +optional
-	MirrorWeight float64 `json:"mirrorWeight,omitempty"`
+	MirrorWeight int `json:"mirrorWeight,omitempty"`
 
 	// Max traffic percentage routed to canary
 	// +optional
diff --git a/pkg/router/istio.go b/pkg/router/istio.go
index f38d6b9a..3cdfd220 100644
--- a/pkg/router/istio.go
+++ b/pkg/router/istio.go
@@ -306,7 +306,7 @@ func (ir *IstioRouter) SetRoutes(
 		}
 
 		if mw := canary.GetAnalysis().MirrorWeight; mw > 0 {
-			vsCopy.Spec.Http[0].MirrorPercentage = &istiov1alpha3.Percent{Value: mw}
+			vsCopy.Spec.Http[0].MirrorPercentage = &istiov1alpha3.Percent{Value: float64(mw)}
 		}
 	}
 
diff --git a/pkg/router/istio_test.go b/pkg/router/istio_test.go
index a2ac03a2..0b9c3591 100644
--- a/pkg/router/istio_test.go
+++ b/pkg/router/istio_test.go
@@ -123,7 +123,7 @@ func TestIstioRouter_SetRoutes(t *testing.T) {
 	})
 
 	t.Run("mirror", func(t *testing.T) {
-		for _, w := range []float64{0, 10, 50} {
+		for _, w := range []int{0, 10, 50} {
 			p, c := 100, 0
 
 			// set mirror weight
@@ -157,7 +157,7 @@ func TestIstioRouter_SetRoutes(t *testing.T) {
 			}
 
 			if w > 0 && assert.NotNil(t, mirrorWeight) {
-				assert.Equal(t, w, mirrorWeight.Value)
+				assert.Equal(t, w, int(mirrorWeight.Value))
 			} else {
 				assert.Nil(t, mirrorWeight)
 			}