diff --git a/platform/mellanox/mlnx-platform-api/sonic_platform/sfp.py b/platform/mellanox/mlnx-platform-api/sonic_platform/sfp.py
index 027d912a6789..65bbd0f83dad 100644
--- a/platform/mellanox/mlnx-platform-api/sonic_platform/sfp.py
+++ b/platform/mellanox/mlnx-platform-api/sonic_platform/sfp.py
@@ -546,9 +546,7 @@ def _dom_capability_detect(self):
 
 
     def _convert_string_to_num(self, value_str):
-        if "-inf" in value_str:
-            return 'N/A'
-        elif "Unknown" in value_str:
+        if "Unknown" in value_str:
             return 'N/A'
         elif 'dBm' in value_str:
             t_str = value_str.rstrip('dBm')