diff --git a/include/wtypes.idl b/include/wtypes.idl
index 89477880616..d08148dc840 100644
--- a/include/wtypes.idl
+++ b/include/wtypes.idl
@@ -133,7 +133,7 @@ typedef struct _SECURITY_DESCRIPTOR {
   PSID Group;
   PACL Sacl;
   PACL Dacl;
-} SECURITY_DESCRIPTOR, *PSECURITY_DESCRIPTOR;
+} SECURITY_DESCRIPTOR, *PISECURITY_DESCRIPTOR;
 
 typedef struct _SECURITY_ATTRIBUTES
 {