diff --git a/sonic_platform_base/sonic_xcvr/api/public/cmis.py b/sonic_platform_base/sonic_xcvr/api/public/cmis.py
index e4edd38c00a6..c667c9b61cb0 100644
--- a/sonic_platform_base/sonic_xcvr/api/public/cmis.py
+++ b/sonic_platform_base/sonic_xcvr/api/public/cmis.py
@@ -790,7 +790,7 @@ def get_aux_mon_type(self):
         '''
         This function returns the aux monitor types
         '''
-        result = self.xcvr_eeprom.read(consts.AUX_MON_TYPE)
+        result = self.xcvr_eeprom.read(consts.AUX_MON_TYPE) if not self.is_flat_memory() else None
         if result is None:
             return None
         aux1_mon_type = result & 0x1