diff --git a/device/mellanox/x86_64-nvidia_sn5640-r0/Mellanox-SN5640-C448O16/sai_5640_448x100g_16x400g.xml b/device/mellanox/x86_64-nvidia_sn5640-r0/Mellanox-SN5640-C448O16/sai_5640_448x100g_16x400g.xml
index a1fcfe94ed3..fe67fcf7c48 100644
--- a/device/mellanox/x86_64-nvidia_sn5640-r0/Mellanox-SN5640-C448O16/sai_5640_448x100g_16x400g.xml
+++ b/device/mellanox/x86_64-nvidia_sn5640-r0/Mellanox-SN5640-C448O16/sai_5640_448x100g_16x400g.xml
@@ -23,7 +23,7 @@
         <device-mac-address>00:02:03:04:05:00</device-mac-address>
 
         <!-- ISSU enabled -->
-        <issu-enabled>0</issu-enabled>
+        <issu-enabled>1</issu-enabled>
 
         <!-- Number of ports in the following port list -->
         <number-of-physical-ports>66</number-of-physical-ports>
diff --git a/device/mellanox/x86_64-nvidia_sn5640-r0/Mellanox-SN5640-C512S2/sai_5640_512x100g.xml b/device/mellanox/x86_64-nvidia_sn5640-r0/Mellanox-SN5640-C512S2/sai_5640_512x100g.xml
index e24a50d39d8..7d481cc0aad 100644
--- a/device/mellanox/x86_64-nvidia_sn5640-r0/Mellanox-SN5640-C512S2/sai_5640_512x100g.xml
+++ b/device/mellanox/x86_64-nvidia_sn5640-r0/Mellanox-SN5640-C512S2/sai_5640_512x100g.xml
@@ -24,7 +24,7 @@
         <device-mac-address>00:02:03:04:05:00</device-mac-address>
 
         <!-- ISSU enabled -->
-        <issu-enabled>0</issu-enabled>
+        <issu-enabled>1</issu-enabled>
 
         <!-- Number of ports in the following port list -->
         <number-of-physical-ports>66</number-of-physical-ports>