diff --git a/dlls/wintrust/wintrust.spec b/dlls/wintrust/wintrust.spec
index 602d4bd79cc..64c51e20375 100644
--- a/dlls/wintrust/wintrust.spec
+++ b/dlls/wintrust/wintrust.spec
@@ -73,6 +73,7 @@
 @ stub TrustFreeDecode
 @ stdcall TrustIsCertificateSelfSigned(ptr)
 @ stub TrustOpenStores
+@ stdcall WTHelperCertCheckValidSignature(ptr)
 @ stub WTHelperCertFindIssuerCertificate
 @ stub WTHelperCertIsSelfSigned
 @ stub WTHelperCheckCertUsage
diff --git a/dlls/wintrust/wintrust_main.c b/dlls/wintrust/wintrust_main.c
index 0a40fbab6f8..c61f6e0f2d6 100644
--- a/dlls/wintrust/wintrust_main.c
+++ b/dlls/wintrust/wintrust_main.c
@@ -1085,3 +1085,12 @@ BOOL WINAPI OpenPersonalTrustDBDialog(HWND hwnd)
     uiCertMgr.pszInitUsageOID = NULL;
     return CryptUIDlgCertMgr(&uiCertMgr);
 }
+
+/***********************************************************************
+ *		WTHelperCertCheckValidSignature
+ */
+HRESULT WINAPI WTHelperCertCheckValidSignature(CRYPT_PROVIDER_DATA *pProvData)
+{
+    FIXME("Stub\n");
+    return S_OK;
+}