diff --git a/Contributors.asciidoc b/Contributors.asciidoc
index e5c34bb8..e619ac29 100644
--- a/Contributors.asciidoc
+++ b/Contributors.asciidoc
@@ -63,4 +63,5 @@ CONTRIBUTOR LIST
 |John Oberschelp                                                |john at oberschelp.net
 |Sam Kelly (DuroSoft Technologies LLC, https://durosoft.com)    |sam at durosoft.com
 |Tobias Urlaub                                                  |saibotu at outlook.de
+|Santiago Ganis                                                 |sganis at gmail.com
 |===
diff --git a/src/dll/posix.c b/src/dll/posix.c
index ad4ef841..4ae27355 100644
--- a/src/dll/posix.c
+++ b/src/dll/posix.c
@@ -190,7 +190,7 @@ FSP_API NTSTATUS FspPosixMapUidToSid(UINT32 Uid, PSID *PSid)
                 Uid - 0x30000);
         }
     }
-    else if (0x100000 <= Uid && Uid < 0x200000)
+    else if (0x100000 <= Uid && Uid < 0x300000)
     {
         if (0 != FspPrimaryDomainSid &&
             5 == FspPrimaryDomainSid->IdentifierAuthority.Value[5] &&