diff --git a/EmulatorPkg/Unix/Host/BlockIo.c b/EmulatorPkg/Unix/Host/BlockIo.c
index 50fe9b575e..fa05fbc107 100644
--- a/EmulatorPkg/Unix/Host/BlockIo.c
+++ b/EmulatorPkg/Unix/Host/BlockIo.c
@@ -661,6 +661,8 @@ EmuBlockIoThunkOpen (
     }
   }
 
+  Private->Mode = Private->WriteProtected ? O_RDONLY : O_RDWR;
+
   This->Interface = &Private->EmuBlockIo;
   This->Private   = Private;
   return EFI_SUCCESS;