diff --git a/dlls/wintrust/asn.c b/dlls/wintrust/asn.c
index 364e7c2dc8827f7f37bd0cf22490669ddadb13b6..97d0d8d53122d5667679bfebd99d3e72b65cb914 100644
--- a/dlls/wintrust/asn.c
+++ b/dlls/wintrust/asn.c
@@ -1902,3 +1902,12 @@ BOOL WINAPI WVTAsn1SpcSpOpusInfoDecode(DWORD dwCertEncodingType,
      pvStructInfo, *pcbStructInfo);
     return FALSE;
 }
+
+BOOL WINAPI WVTAsn1CatMemberInfoDecode(DWORD dwCertEncodingType,
+ LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
+ void *pvStructInfo, DWORD *pcbStructInfo)
+{
+    FIXME("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
+     pvStructInfo, *pcbStructInfo);
+    return FALSE;
+}
diff --git a/dlls/wintrust/wintrust.spec b/dlls/wintrust/wintrust.spec
index 35e1b2f56b8b74421783bfe920bb1eb00419c490..28de78be41fe8e622a770c61aa9ffb126543416a 100644
--- a/dlls/wintrust/wintrust.spec
+++ b/dlls/wintrust/wintrust.spec
@@ -86,7 +86,7 @@
 @ stub WTHelperIsInRootStore
 @ stub WTHelperOpenKnownStores
 @ stdcall WTHelperProvDataFromStateData(ptr)
-@ stub WVTAsn1CatMemberInfoDecode
+@ stdcall WVTAsn1CatMemberInfoDecode(long str ptr long long ptr ptr)
 @ stdcall WVTAsn1CatMemberInfoEncode(long str ptr ptr ptr)
 @ stub WVTAsn1CatNameValueDecode
 @ stub WVTAsn1CatNameValueEncode