diff --git a/src/spawn_sync.cc b/src/spawn_sync.cc
index 1e966e42c68ce6..ba29aaeef03618 100644
--- a/src/spawn_sync.cc
+++ b/src/spawn_sync.cc
@@ -981,7 +981,8 @@ int SyncProcessRunner::CopyJsString(Local<Value> js_value,
   if (js_value->IsString())
     js_string = js_value.As<String>();
   else
-    js_string = js_value->ToString(env()->isolate());
+    js_string = js_value->ToString(env()->isolate()->GetCurrentContext())
+                    .ToLocalChecked();
 
   // Include space for null terminator byte.
   size = StringBytes::StorageSize(isolate, js_string, UTF8) + 1;
@@ -1025,7 +1026,12 @@ int SyncProcessRunner::CopyJsStringArray(Local<Value> js_value,
     auto value = js_array->Get(context, i).ToLocalChecked();
 
     if (!value->IsString())
-      js_array->Set(context, i, value->ToString(env()->isolate())).FromJust();
+      js_array
+          ->Set(context,
+                i,
+                value->ToString(env()->isolate()->GetCurrentContext())
+                    .ToLocalChecked())
+          .FromJust();
 
     data_size += StringBytes::StorageSize(isolate, value, UTF8) + 1;
     data_size = ROUND_UP(data_size, sizeof(void*));
diff --git a/src/string_bytes.cc b/src/string_bytes.cc
index b7f009fe1fcc16..82d699db9a81e5 100644
--- a/src/string_bytes.cc
+++ b/src/string_bytes.cc
@@ -410,7 +410,8 @@ size_t StringBytes::StorageSize(Isolate* isolate,
     return Buffer::Length(val);
   }
 
-  Local<String> str = val->ToString(isolate);
+  Local<String> str =
+      val->ToString(isolate->GetCurrentContext()).ToLocalChecked();
 
   switch (encoding) {
     case ASCII:
@@ -456,7 +457,8 @@ size_t StringBytes::Size(Isolate* isolate,
   if (Buffer::HasInstance(val) && (encoding == BUFFER || encoding == LATIN1))
     return Buffer::Length(val);
 
-  Local<String> str = val->ToString(isolate);
+  Local<String> str =
+      val->ToString(isolate->GetCurrentContext()).ToLocalChecked();
 
   switch (encoding) {
     case ASCII:
diff --git a/src/util.cc b/src/util.cc
index c36ea5169d3313..44c47f0f9163dc 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -37,9 +37,8 @@ template <typename T>
 static void MakeUtf8String(Isolate* isolate,
                            Local<Value> value,
                            T* target) {
-  Local<String> string = value->ToString(isolate);
-  if (string.IsEmpty())
-    return;
+  Local<String> string;
+  if (!value->ToString(isolate->GetCurrentContext()).ToLocal(&string)) return;
 
   const size_t storage = StringBytes::StorageSize(isolate, string, UTF8) + 1;
   target->AllocateSufficientStorage(storage);
@@ -63,9 +62,8 @@ TwoByteValue::TwoByteValue(Isolate* isolate, Local<Value> value) {
     return;
   }
 
-  Local<String> string = value->ToString(isolate);
-  if (string.IsEmpty())
-    return;
+  Local<String> string;
+  if (!value->ToString(isolate->GetCurrentContext()).ToLocal(&string)) return;
 
   // Allocate enough space to include the null terminator
   const size_t storage = string->Length() + 1;