diff --git a/dlls/wintrust/crypt.c b/dlls/wintrust/crypt.c
index 544d1aa0815..136f795e3cf 100644
--- a/dlls/wintrust/crypt.c
+++ b/dlls/wintrust/crypt.c
@@ -69,12 +69,12 @@ BOOL WINAPI CryptCATAdminAcquireContext(HCATADMIN* catAdmin,
 /***********************************************************************
  *             CryptCATAdminAddCatalog (WINTRUST.@)
  */
-BOOL WINAPI CryptCATAdminAddCatalog(HCATADMIN catAdmin, PWSTR catalogFile,
-                                    PWSTR selectBaseName, DWORD flags)
+HCATINFO WINAPI CryptCATAdminAddCatalog(HCATADMIN catAdmin, PWSTR catalogFile,
+                                        PWSTR selectBaseName, DWORD flags)
 {
     FIXME("%p %s %s %d\n", catAdmin, debugstr_w(catalogFile),
           debugstr_w(selectBaseName), flags);
-    return TRUE;
+    return (HCATINFO) 0xdeeeaaadL;
 }
 
 /***********************************************************************
diff --git a/include/mscat.h b/include/mscat.h
index f5e9f0f7b7d..e48120765f8 100644
--- a/include/mscat.h
+++ b/include/mscat.h
@@ -49,7 +49,7 @@ typedef struct CRYPTCATMEMBER_ {
 
 
 BOOL      WINAPI CryptCATAdminAcquireContext(HCATADMIN*,const GUID*,DWORD);
-BOOL      WINAPI CryptCATAdminAddCatalog(HCATADMIN,PWSTR,PWSTR,DWORD);
+HCATINFO  WINAPI CryptCATAdminAddCatalog(HCATADMIN,PWSTR,PWSTR,DWORD);
 BOOL      WINAPI CryptCATAdminCalcHashFromFileHandle(HANDLE,DWORD*,BYTE*,DWORD);
 HCATINFO  WINAPI CryptCATAdminEnumCatalogFromHash(HCATADMIN,BYTE*,DWORD,DWORD,HCATINFO*);
 BOOL      WINAPI CryptCATAdminReleaseCatalogContext(HCATADMIN,HCATINFO,DWORD);