diff --git a/src/expand.cc b/src/expand.cc
index 5a56d7c..263d9c1 100644
--- a/src/expand.cc
+++ b/src/expand.cc
@@ -120,9 +120,10 @@ void ExpandAddress(const Nan::FunctionCallbackInfo<v8::Value>& info) {
     for (i = 0; i < num_expansions; i++) {
         v8::Local<v8::String> e = Nan::New(expansions[i]).ToLocalChecked();
         ret->Set(context, i, e);
-        free(expansions[i]);
     }
-    free(expansions);
+
+    // Free expansions
+    libpostal_expansion_array_destroy(expansions, num_expansions);
 
     info.GetReturnValue().Set(ret);
 }