diff --git a/lib/internal/http.js b/lib/internal/http.js
index fcfd2c91f22d33..09294888be5e70 100644
--- a/lib/internal/http.js
+++ b/lib/internal/http.js
@@ -3,8 +3,8 @@
 const { setUnrefTimeout } = require('internal/timers');
 const { PerformanceEntry, notify } = internalBinding('performance');
 
-var nowCache;
-var utcCache;
+let nowCache;
+let utcCache;
 
 function nowDate() {
   if (!nowCache) cache();