diff --git a/packages/mitmproxy/src/lib/choice/index.js b/packages/mitmproxy/src/lib/choice/index.js
index 964c2c6..734fc94 100644
--- a/packages/mitmproxy/src/lib/choice/index.js
+++ b/packages/mitmproxy/src/lib/choice/index.js
@@ -7,6 +7,9 @@ class ChoiceCache {
   constructor () {
     this.cache = new LRUCache({
       maxSize: cacheSize,
+      sizeCalculation: () => {
+        return 1
+      },
     })
   }
 
diff --git a/packages/mitmproxy/src/lib/dns/base.js b/packages/mitmproxy/src/lib/dns/base.js
index cc40863..d2dcf48 100644
--- a/packages/mitmproxy/src/lib/dns/base.js
+++ b/packages/mitmproxy/src/lib/dns/base.js
@@ -25,6 +25,9 @@ module.exports = class BaseDNS {
   constructor () {
     this.cache = new LRUCache({
       maxSize: cacheSize,
+      sizeCalculation: () => {
+        return 1
+      },
     })
   }