diff --git a/reactos/lib/lsalib/lsa.c b/reactos/lib/lsalib/lsa.c
index 94cd6af8e16..31c2aeb197f 100644
--- a/reactos/lib/lsalib/lsa.c
+++ b/reactos/lib/lsalib/lsa.c
@@ -264,8 +264,8 @@ LsaLogonUser(HANDLE LsaHandle,
                                      0,
                                      Reply->d.LogonUserReply.ProfileBufferLength);
     memcpy(*ProfileBuffer,
-           (PVOID)((ULONG)Reply->d.LogonUserReply.Data +
-                   (ULONG)Reply->d.LogonUserReply.ProfileBuffer),
+           (PVOID)((ULONG_PTR)Reply->d.LogonUserReply.Data +
+                   (ULONG_PTR)Reply->d.LogonUserReply.ProfileBuffer),
            Reply->d.LogonUserReply.ProfileBufferLength);
     *LogonId = Reply->d.LogonUserReply.LogonId;
     *Token = Reply->d.LogonUserReply.Token;