diff --git a/dll/win32/inseng/inseng.spec b/dll/win32/inseng/inseng.spec
index b3a2ce2f7fb..28028e4c887 100644
--- a/dll/win32/inseng/inseng.spec
+++ b/dll/win32/inseng/inseng.spec
@@ -3,7 +3,7 @@
 @ stdcall CheckTrustEx(ptr ptr ptr ptr ptr)
 @ stdcall -private DllCanUnloadNow()
 @ stdcall -private DllGetClassObject(ptr ptr ptr)
-@ stub DllInstall
+@ stub -private DllInstall
 @ stdcall -private DllRegisterServer()
 @ stdcall -private DllUnregisterServer()
 @ stub DownloadFile
diff --git a/dll/win32/itircl/itircl.spec b/dll/win32/itircl/itircl.spec
index a9b7505d360..c558f8f2211 100644
--- a/dll/win32/itircl/itircl.spec
+++ b/dll/win32/itircl/itircl.spec
@@ -1,4 +1,4 @@
 @ stdcall -private DllCanUnloadNow()
-@ stub DllGetClassObject
+@ stub -private DllGetClassObject
 @ stdcall -private DllRegisterServer()
 @ stdcall -private DllUnregisterServer()
diff --git a/dll/win32/itss/itss.spec b/dll/win32/itss/itss.spec
index 7437ca82333..03ae060ec94 100644
--- a/dll/win32/itss/itss.spec
+++ b/dll/win32/itss/itss.spec
@@ -1,6 +1,6 @@
 @ stdcall -private DllCanUnloadNow()
 @ stdcall -private DllGetClassObject(ptr ptr ptr)
-@ stub DllInstall
+@ stub -private DllInstall
 @ stdcall -private DllMain(long long ptr)
 @ stdcall -private DllRegisterServer()
 @ stdcall -private DllUnregisterServer()