diff --git a/pkg/simple/client/cache/cache.go b/pkg/simple/client/cache/cache.go
index 2c1235009..374f6c0fb 100644
--- a/pkg/simple/client/cache/cache.go
+++ b/pkg/simple/client/cache/cache.go
@@ -17,7 +17,6 @@ limitations under the License.
 package cache
 
 import (
-	"encoding/json"
 	"fmt"
 	"time"
 
@@ -54,12 +53,6 @@ type Interface interface {
 // For InMemoryCache, options key can be "cleanupperiod"
 type DynamicOptions map[string]interface{}
 
-func (o DynamicOptions) MarshalJSON() ([]byte, error) {
-
-	data, err := json.Marshal(o)
-	return data, err
-}
-
 func RegisterCacheFactory(factory CacheFactory) {
 	cacheFactories[factory.Type()] = factory
 }