diff --git a/src/npruntime-impl.h b/src/npruntime-impl.h
index d3595b1..4adca89 100644
--- a/src/npruntime-impl.h
+++ b/src/npruntime-impl.h
@@ -41,6 +41,7 @@ extern NPObject *npobject_lookup_local(uint32_t id) attribute_hidden;
 // corresponding stub. Holds a reference to the other NPObject on via
 // its stub.
 extern NPObject *npobject_create_proxy(NPP npp, uint32_t id) attribute_hidden;
+extern bool npobject_is_proxy(NPObject *npobj) attribute_hidden;
 extern uint32_t npobject_get_proxy_id(NPObject *npobj) attribute_hidden;
 extern void npobject_destroy_proxy(NPObject *npobj, bool release_stub) attribute_hidden;
 
diff --git a/src/npruntime.c b/src/npruntime.c
index b4776d7..e6ddac1 100644
--- a/src/npruntime.c
+++ b/src/npruntime.c
@@ -153,6 +153,11 @@ NPObject *npobject_create_proxy(NPP instance, uint32_t id)
   return object;
 }
 
+bool npobject_is_proxy(NPObject *npobj)
+{
+  return npobject_get_proxy(npobj) != NULL;
+}
+
 uint32_t npobject_get_proxy_id(NPObject *npobj)
 {
   NPObjectProxy *proxy = npobject_get_proxy(npobj);
diff --git a/src/npw-viewer.c b/src/npw-viewer.c
index ccfa95f..a84e8bc 100644
--- a/src/npw-viewer.c
+++ b/src/npw-viewer.c
@@ -1958,7 +1958,9 @@ g_NPN_CreateObject(NPP instance, NPClass *class)
 	npobj->_class = class;
 	npobj->referenceCount = 1;
 
-	if (npobject_get_proxy_id(npobj) == 0) {
+	// We specifically cannot call npobject_get_proxy_id here because
+	// the proxy has only been allocated, not constructed. (Sigh.)
+	if (!npobject_is_proxy(npobj)) {
 	  // Register anything that isn't a proxy.
 	  npobject_register(npobj, plugin);
 	  if (plugin)