diff --git a/dlls/gpkcsp/gpkcsp.spec b/dlls/gpkcsp/gpkcsp.spec
index 1f828b09812..af3cdee2ae5 100644
--- a/dlls/gpkcsp/gpkcsp.spec
+++ b/dlls/gpkcsp/gpkcsp.spec
@@ -22,5 +22,5 @@
 @ stub CPSignHash
 @ stub CPVerifySignature
 @ stdcall DllMain(ptr long ptr)
-@ stub DllRegisterServer
-@ stub DllUnregisterServer
+@ stdcall -private DllRegisterServer()
+@ stdcall -private DllUnregisterServer()
diff --git a/dlls/gpkcsp/main.c b/dlls/gpkcsp/main.c
index b6d9f177472..79f1e2dce63 100644
--- a/dlls/gpkcsp/main.c
+++ b/dlls/gpkcsp/main.c
@@ -44,3 +44,21 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
     }
     return TRUE;
 }
+
+/*****************************************************
+ *    DllRegisterServer (GPKCSP.@)
+ */
+HRESULT WINAPI DllRegisterServer(void)
+{
+    FIXME("Not implemented.\n");
+    return E_UNEXPECTED;
+}
+
+/*****************************************************
+ *    DllUnregisterServer (GPKCSP.@)
+ */
+HRESULT WINAPI DllUnregisterServer(void)
+{
+    FIXME("Not implemented.\n");
+    return E_UNEXPECTED;
+}