diff --git a/reactos/dll/win32/advapi32/sec/lsa.c b/reactos/dll/win32/advapi32/sec/lsa.c
index 5f3b4dbfc09..032a5bd0ea9 100644
--- a/reactos/dll/win32/advapi32/sec/lsa.c
+++ b/reactos/dll/win32/advapi32/sec/lsa.c
@@ -460,7 +460,7 @@ LsaQueryInformationPolicy(LSA_HANDLE PolicyHandle,
 	      };
 	      SID_IDENTIFIER_AUTHORITY localSidAuthority = {SECURITY_NT_AUTHORITY};
 
-	      struct di * xdi = RtlAllocateHeap(RtlGetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(xdi));
+	      struct di * xdi = RtlAllocateHeap(RtlGetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*xdi));
               HKEY key;
               BOOL useDefault = TRUE;
               LONG ret;