diff --git a/Redfish.md b/Redfish.md
index cc714eb..3f65de8 100644
--- a/Redfish.md
+++ b/Redfish.md
@@ -768,6 +768,11 @@
 - Members
 - Members@odata.count
 
+### /redfish/v1/Systems/system/PCIeDevices/{PCIeDevice}/
+
+- PCIeInterface
+  - LanesInUse
+
 ### /redfish/v1/Systems/system/Processors/
 
 #### ProcessorCollection
diff --git a/redfish-core/lib/pcie.hpp b/redfish-core/lib/pcie.hpp
index c91e52d..77afd0a 100644
--- a/redfish-core/lib/pcie.hpp
+++ b/redfish-core/lib/pcie.hpp
@@ -192,11 +192,12 @@
             const std::string* manufacturer = nullptr;
             const std::string* deviceType = nullptr;
             const std::string* generationInUse = nullptr;
+            const size_t* lanesInUse = nullptr;
 
             const bool success = sdbusplus::unpackPropertiesNoThrow(
                 dbus_utils::UnpackErrorPrinter(), pcieDevProperties,
                 "Manufacturer", manufacturer, "DeviceType", deviceType,
-                "GenerationInUse", generationInUse);
+                "LanesInUse", lanesInUse, "GenerationInUse", generationInUse);
 
             if (!success)
             {
@@ -204,6 +205,14 @@
                 return;
             }
 
+            // The default value of LanesInUse is 0, and the field will be
+            // left as off if it is a default value.
+            if (lanesInUse != nullptr && *lanesInUse != 0)
+            {
+                asyncResp->res.jsonValue["PCIeInterface"]["LanesInUse"] =
+                    *lanesInUse;
+            }
+
             if (generationInUse != nullptr)
             {
                 std::optional<pcie_device::PCIeTypes> redfishGenerationInUse =