diff --git a/dlls/mapi32/mapi32.spec b/dlls/mapi32/mapi32.spec
index 7292e528bf6..bf97415299d 100644
--- a/dlls/mapi32/mapi32.spec
+++ b/dlls/mapi32/mapi32.spec
@@ -16,7 +16,7 @@
  24 stub PRProviderInit
  25 stub LAUNCHWIZARD
  26 stub LaunchWizard@20
- 27 stub DllGetClassObject
+ 27 stdcall -private DllGetClassObject(ptr ptr ptr)
  28 stdcall -private DllCanUnloadNow()
  29 stub MAPIOpenFormMgr
  30 stub MAPIOpenFormMgr@8
diff --git a/dlls/mapi32/mapi32_main.c b/dlls/mapi32/mapi32_main.c
index a985ac62c86..edfa3267b69 100644
--- a/dlls/mapi32/mapi32_main.c
+++ b/dlls/mapi32/mapi32_main.c
@@ -52,6 +52,16 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID fImpLoad)
     return TRUE;
 }
 
+/***********************************************************************
+ *		DllGetClassObject (MAPI32.27)
+ */
+HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID iid, LPVOID *ppv)
+{
+    *ppv = NULL;
+    FIXME("\n\tCLSID:\t%s,\n\tIID:\t%s\n", debugstr_guid(rclsid), debugstr_guid(iid));
+    return CLASS_E_CLASSNOTAVAILABLE;
+}
+
 /***********************************************************************
  * DllCanUnloadNow (MAPI32.28)
  *