diff --git a/dlls/wintrust/wintrust.spec b/dlls/wintrust/wintrust.spec
index 191e3d1c87..f3859338a6 100644
--- a/dlls/wintrust/wintrust.spec
+++ b/dlls/wintrust/wintrust.spec
@@ -79,7 +79,7 @@
 @ stub WTHelperGetAgencyInfo
 @ stdcall WTHelperGetFileHandle(ptr)
 @ stdcall WTHelperGetFileName(ptr)
-@ stub WTHelperGetKnownUsages
+@ stdcall WTHelperGetKnownUsages(long ptr)
 @ stdcall WTHelperGetProvCertFromChain(ptr long)
 @ stdcall WTHelperGetProvPrivateDataFromChain(ptr ptr)
 @ stdcall WTHelperGetProvSignerFromChain(ptr long long long)
diff --git a/dlls/wintrust/wintrust_main.c b/dlls/wintrust/wintrust_main.c
index 2218ca0486..2cfc898842 100644
--- a/dlls/wintrust/wintrust_main.c
+++ b/dlls/wintrust/wintrust_main.c
@@ -735,6 +735,15 @@ HANDLE WINAPI WTHelperGetFileHandle(WINTRUST_DATA *data)
         return INVALID_HANDLE_VALUE;
 }
 
+/***********************************************************************
+ *		WTHelperGetKnownUsages(WINTRUST.@)
+ */
+BOOL WINAPI WTHelperGetKnownUsages(DWORD action, PCCRYPT_OID_INFO **usages)
+{
+    FIXME("(%d, %p): stub\n", action, usages);
+    return FALSE;
+}
+
 static const WCHAR Software_Publishing[] = {
  'S','o','f','t','w','a','r','e','\\',
  'M','i','c','r','o','s','o','f','t','\\',