diff --git a/reactos/include/psdk/ntlsa.h b/reactos/include/psdk/ntlsa.h
index 69c96cc5cbd..5f982a6297c 100644
--- a/reactos/include/psdk/ntlsa.h
+++ b/reactos/include/psdk/ntlsa.h
@@ -57,6 +57,7 @@ extern "C" {
 #define SECURITY_ACCESS_REMOTE_INTERACTIVE_LOGON      0x00000400
 #define SECURITY_ACCESS_DENY_REMOTE_INTERACTIVE_LOGON 0x00000800
 
+#ifndef _NTSECAPI_H // HACK to avoid redefinition from ntsecapi.h
 typedef enum _POLICY_AUDIT_EVENT_TYPE
 {
     AuditCategorySystem,
@@ -69,6 +70,7 @@ typedef enum _POLICY_AUDIT_EVENT_TYPE
     AuditCategoryDirectoryServiceAccess,
     AuditCategoryAccountLogon
 } POLICY_AUDIT_EVENT_TYPE, *PPOLICY_AUDIT_EVENT_TYPE;
+#endif
 
 #ifdef __cplusplus
 }