diff --git a/packages/binding-http/src/http-server.ts b/packages/binding-http/src/http-server.ts
index 9e685894e..d8c00b536 100644
--- a/packages/binding-http/src/http-server.ts
+++ b/packages/binding-http/src/http-server.ts
@@ -348,7 +348,7 @@ export default class HttpServer implements ProtocolServer {
                         "writemultipleproperties",
                     ];
                 }
-                if (!thing.forms) {
+                if (thing.forms == null) {
                     thing.forms = [];
                 }
                 thing.forms.push(form);