diff --git a/lib/internal/process/per_thread.js b/lib/internal/process/per_thread.js
index 7a3bee3098e8e9..5706d560baeb9c 100644
--- a/lib/internal/process/per_thread.js
+++ b/lib/internal/process/per_thread.js
@@ -15,7 +15,7 @@ const {
     ERR_UNKNOWN_SIGNAL
   }
 } = require('internal/errors');
-const util = require('util');
+const format = require('internal/util/inspect').format;
 const constants = internalBinding('constants').os.signals;
 
 function assert(x, msg) {
@@ -32,7 +32,7 @@ function wrapProcessMethods(binding) {
   } = binding;
 
   function _rawDebug(...args) {
-    binding._rawDebug(util.format.apply(null, args));
+    binding._rawDebug(format.apply(null, args));
   }
 
   // Create the argument array that will be passed to the native function.