diff --git a/src/node_os.cc b/src/node_os.cc
index f2b449ac0d93f7..c6c6b42028068e 100644
--- a/src/node_os.cc
+++ b/src/node_os.cc
@@ -260,7 +260,7 @@ static void GetInterfaceAddresses(const FunctionCallbackInfo<Value>& args) {
     result.emplace_back(OneByteString(isolate, ip));
     result.emplace_back(OneByteString(isolate, netmask));
     result.emplace_back(family);
-    result.emplace_back(FIXED_ONE_BYTE_STRING(isolate, mac));
+    result.emplace_back(OneByteString(isolate, mac.data(), mac.size() - 1));
     result.emplace_back(
         Boolean::New(env->isolate(), interfaces[i].is_internal));
     if (interfaces[i].address.address4.sin_family == AF_INET6) {
diff --git a/src/util-inl.h b/src/util-inl.h
index fbce06d7cef9c2..b55dc25b98c551 100644
--- a/src/util-inl.h
+++ b/src/util-inl.h
@@ -160,33 +160,34 @@ constexpr ContainerOfHelper<Inner, Outer> ContainerOf(Inner Outer::*field,
 
 inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
                                            const char* data,
-                                           int length) {
-  return v8::String::NewFromOneByte(isolate,
-                                    reinterpret_cast<const uint8_t*>(data),
-                                    v8::NewStringType::kNormal,
-                                    length).ToLocalChecked();
+                                           int length,
+                                           v8::NewStringType type) {
+  return v8::String::NewFromOneByte(
+             isolate, reinterpret_cast<const uint8_t*>(data), type, length)
+      .ToLocalChecked();
 }
 
 inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
                                            const signed char* data,
-                                           int length) {
-  return v8::String::NewFromOneByte(isolate,
-                                    reinterpret_cast<const uint8_t*>(data),
-                                    v8::NewStringType::kNormal,
-                                    length).ToLocalChecked();
+                                           int length,
+                                           v8::NewStringType type) {
+  return v8::String::NewFromOneByte(
+             isolate, reinterpret_cast<const uint8_t*>(data), type, length)
+      .ToLocalChecked();
 }
 
 inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
                                            const unsigned char* data,
-                                           int length) {
-  return v8::String::NewFromOneByte(
-             isolate, data, v8::NewStringType::kNormal, length)
+                                           int length,
+                                           v8::NewStringType type) {
+  return v8::String::NewFromOneByte(isolate, data, type, length)
       .ToLocalChecked();
 }
 
 inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
-                                           std::string_view str) {
-  return OneByteString(isolate, str.data(), str.size());
+                                           std::string_view str,
+                                           v8::NewStringType type) {
+  return OneByteString(isolate, str.data(), str.size(), type);
 }
 
 char ToLower(char c) {
diff --git a/src/util.h b/src/util.h
index b6f49bcf8e7eab..62ee2fe3207505 100644
--- a/src/util.h
+++ b/src/util.h
@@ -331,21 +331,29 @@ class KVStore {
 };
 
 // Convenience wrapper around v8::String::NewFromOneByte().
-inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
-                                           const char* data,
-                                           int length = -1);
+inline v8::Local<v8::String> OneByteString(
+    v8::Isolate* isolate,
+    const char* data,
+    int length = -1,
+    v8::NewStringType type = v8::NewStringType::kNormal);
 
 // For the people that compile with -funsigned-char.
-inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
-                                           const signed char* data,
-                                           int length = -1);
+inline v8::Local<v8::String> OneByteString(
+    v8::Isolate* isolate,
+    const signed char* data,
+    int length = -1,
+    v8::NewStringType type = v8::NewStringType::kNormal);
 
-inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
-                                           const unsigned char* data,
-                                           int length = -1);
+inline v8::Local<v8::String> OneByteString(
+    v8::Isolate* isolate,
+    const unsigned char* data,
+    int length = -1,
+    v8::NewStringType type = v8::NewStringType::kNormal);
 
-inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
-                                           std::string_view str);
+inline v8::Local<v8::String> OneByteString(
+    v8::Isolate* isolate,
+    std::string_view str,
+    v8::NewStringType type = v8::NewStringType::kNormal);
 
 // Used to be a macro, hence the uppercase name.
 template <std::size_t N>
@@ -353,15 +361,7 @@ template <std::size_t N>
 inline v8::Local<v8::String> FIXED_ONE_BYTE_STRING(v8::Isolate* isolate,
                                                    const char (&data)[N]) {
   CHECK_EQ(data[N - 1], '\0');
-  return OneByteString(isolate, data, N - 1);
-}
-
-template <std::size_t N>
-  requires(N > 0)
-inline v8::Local<v8::String> FIXED_ONE_BYTE_STRING(
-    v8::Isolate* isolate, const std::array<char, N>& arr) {
-  CHECK_EQ(arr[N - 1], '\0');
-  return OneByteString(isolate, arr.data(), N - 1);
+  return OneByteString(isolate, data, N - 1, v8::NewStringType::kInternalized);
 }
 
 // tolower() is locale-sensitive.  Use ToLower() instead.