diff --git a/src/vbox/vbox_common.h b/src/vbox/vbox_common.h
index ec2f9637dc..a2d0903c45 100644
--- a/src/vbox/vbox_common.h
+++ b/src/vbox/vbox_common.h
@@ -405,6 +405,9 @@ typedef nsISupports IKeyboard;
             abort(); \
     } while (0)
 
+#define VBOX_QUERY_INTERFACE(nsi, iid, resultp) \
+    gVBoxAPI.nsUISupports.QueryInterface((void*)(nsi), iid, resultp)
+
 #define VBOX_ADDREF(arg)                gVBoxAPI.nsUISupports.AddRef((void *)(arg))
 
 #define VBOX_RELEASE(arg) \
diff --git a/src/vbox/vbox_tmpl.c b/src/vbox/vbox_tmpl.c
index 9976867004..32bfbecabc 100644
--- a/src/vbox/vbox_tmpl.c
+++ b/src/vbox/vbox_tmpl.c
@@ -561,6 +561,11 @@ static void* _handleHostGetNetworkInterfaces(IHost *host)
     return host->vtbl->GetNetworkInterfaces;
 }
 
+static nsresult _nsisupportsQueryInterface(nsISupports *nsi, const nsID *iid, void **resultp)
+{
+    return nsi->vtbl->QueryInterface(nsi, iid, resultp);
+}
+
 static nsresult _nsisupportsRelease(nsISupports *nsi)
 {
     return nsi->vtbl->Release(nsi);
@@ -2219,6 +2224,7 @@ static vboxUniformedArray _UArray = {
 };
 
 static vboxUniformednsISupports _nsUISupports = {
+    .QueryInterface = _nsisupportsQueryInterface,
     .Release = _nsisupportsRelease,
     .AddRef = _nsisupportsAddRef,
 };
diff --git a/src/vbox/vbox_uniformed_api.h b/src/vbox/vbox_uniformed_api.h
index c1a2af1d42..ba655feb95 100644
--- a/src/vbox/vbox_uniformed_api.h
+++ b/src/vbox/vbox_uniformed_api.h
@@ -145,6 +145,7 @@ typedef struct {
 
 /* Functions for nsISupports */
 typedef struct {
+    nsresult (*QueryInterface)(nsISupports *nsi, const nsID *iid, void **resultp);
     nsresult (*Release)(nsISupports *nsi);
     nsresult (*AddRef)(nsISupports *nsi);
 } vboxUniformednsISupports;