diff --git a/pkg/openapi/validation.go b/pkg/openapi/validation.go
index 701b056c61..e11c33bbcc 100644
--- a/pkg/openapi/validation.go
+++ b/pkg/openapi/validation.go
@@ -216,23 +216,23 @@ func generateEmptyResource(kindSchema *openapi_v2.Schema) interface{} {
 	case "integer":
 		if kindSchema.GetDefault() != nil {
 			val, _ := strconv.Atoi(string(kindSchema.GetDefault().Value.Value))
-			return val
+			return int64(val)
 		}
 		if kindSchema.GetExample() != nil {
 			val, _ := strconv.Atoi(string(kindSchema.GetExample().GetValue().Value))
-			return val
+			return int64(val)
 		}
-		return 0
+		return int64(0)
 	case "number":
 		if kindSchema.GetDefault() != nil {
 			val, _ := strconv.Atoi(string(kindSchema.GetDefault().Value.Value))
-			return val
+			return int64(val)
 		}
 		if kindSchema.GetExample() != nil {
 			val, _ := strconv.Atoi(string(kindSchema.GetExample().GetValue().Value))
-			return val
+			return int64(val)
 		}
-		return 0
+		return int64(0)
 	case "boolean":
 		if kindSchema.GetDefault() != nil {
 			return string(kindSchema.GetDefault().Value.Value) == "true"
diff --git a/pkg/openapi/validation_test.go b/pkg/openapi/validation_test.go
index 4c6c8ac2a6..6723c13b0c 100644
--- a/pkg/openapi/validation_test.go
+++ b/pkg/openapi/validation_test.go
@@ -8,10 +8,6 @@ import (
 )
 
 func Test_ValidateMutationPolicy(t *testing.T) {
-	err := setValidationGlobalState()
-	if err != nil {
-		t.Fatalf("Could not set global state")
-	}
 
 	tcs := []struct {
 		description string
diff --git a/pkg/webhooks/mutation.go b/pkg/webhooks/mutation.go
index 650fce8374..d6df3fcb34 100644
--- a/pkg/webhooks/mutation.go
+++ b/pkg/webhooks/mutation.go
@@ -3,6 +3,8 @@ package webhooks
 import (
 	"time"
 
+	"github.com/nirmata/kyverno/pkg/openapi"
+
 	"github.com/golang/glog"
 	kyverno "github.com/nirmata/kyverno/pkg/api/kyverno/v1"
 	"github.com/nirmata/kyverno/pkg/engine"
@@ -101,6 +103,11 @@ func (ws *WebhookServer) HandleMutation(request *v1beta1.AdmissionRequest, resou
 			glog.V(4).Infof("Failed to apply policy %s on resource %s/%s\n", policy.Name, resource.GetNamespace(), resource.GetName())
 			continue
 		}
+		err := openapi.ValidateResource(engineResponse.PatchedResource.UnstructuredContent(), engineResponse.PatchedResource.GetKind())
+		if err != nil {
+			glog.V(4).Infoln(err)
+			continue
+		}
 		// gather patches
 		patches = append(patches, engineResponse.GetPatches()...)
 		glog.V(4).Infof("Mutation from policy %s has applied successfully to %s %s/%s", policy.Name, request.Kind.Kind, resource.GetNamespace(), resource.GetName())