diff --git a/src/Extism.Pdk/Interop.cs b/src/Extism.Pdk/Interop.cs
index 33df13c..e7598cc 100644
--- a/src/Extism.Pdk/Interop.cs
+++ b/src/Extism.Pdk/Interop.cs
@@ -315,7 +315,7 @@ public static HttpResponse SendRequest(HttpRequest request)
 
             if (request.Headers.Count > 0)
             {
-                writer.WriteStartObject("header");
+                writer.WriteStartObject("headers");
                 foreach (var kvp in request.Headers)
                 {
                     writer.WriteString(kvp.Key, kvp.Value);