diff --git a/redfish-core/lib/certificate_service.hpp b/redfish-core/lib/certificate_service.hpp
index b931c7d..2fc606d 100644
--- a/redfish-core/lib/certificate_service.hpp
+++ b/redfish-core/lib/certificate_service.hpp
@@ -155,7 +155,7 @@
     CertificateFile& operator=(const CertificateFile&) = delete;
     CertificateFile(CertificateFile&&) = delete;
     CertificateFile& operator=(CertificateFile&&) = delete;
-    CertificateFile(const std::string& certString)
+    explicit CertificateFile(const std::string& certString)
     {
         std::array<char, 18> dirTemplate = {'/', 't', 'm', 'p', '/', 'C',
                                             'e', 'r', 't', 's', '.', 'X',
diff --git a/redfish-core/lib/health.hpp b/redfish-core/lib/health.hpp
index 04281bf..cf84c93 100644
--- a/redfish-core/lib/health.hpp
+++ b/redfish-core/lib/health.hpp
@@ -31,8 +31,10 @@
 struct HealthPopulate : std::enable_shared_from_this<HealthPopulate>
 {
     // By default populate status to "/Status" of |asyncResp->res.jsonValue|.
-    HealthPopulate(const std::shared_ptr<bmcweb::AsyncResp>& asyncRespIn) :
-        asyncResp(asyncRespIn), statusPtr("/Status")
+    explicit HealthPopulate(
+        const std::shared_ptr<bmcweb::AsyncResp>& asyncRespIn) :
+        asyncResp(asyncRespIn),
+        statusPtr("/Status")
     {}
 
     // Takes a JSON pointer rather than a reference. This is pretty useful when
diff --git a/redfish-core/lib/managers.hpp b/redfish-core/lib/managers.hpp
index f15fb0b..bda5a1a 100644
--- a/redfish-core/lib/managers.hpp
+++ b/redfish-core/lib/managers.hpp
@@ -1168,7 +1168,8 @@
 struct GetPIDValues : std::enable_shared_from_this<GetPIDValues>
 {
 
-    GetPIDValues(const std::shared_ptr<bmcweb::AsyncResp>& asyncRespIn) :
+    explicit GetPIDValues(
+        const std::shared_ptr<bmcweb::AsyncResp>& asyncRespIn) :
         asyncResp(asyncRespIn)
 
     {}
diff --git a/redfish-core/lib/sensors.hpp b/redfish-core/lib/sensors.hpp
index ca842d9..8b97b7c 100644
--- a/redfish-core/lib/sensors.hpp
+++ b/redfish-core/lib/sensors.hpp
@@ -307,7 +307,7 @@
 class InventoryItem
 {
   public:
-    InventoryItem(const std::string& objPath) : objectPath(objPath)
+    explicit InventoryItem(const std::string& objPath) : objectPath(objPath)
     {
         // Set inventory item name to last node of object path
         sdbusplus::message::object_path path(objectPath);
diff --git a/redfish-core/lib/task.hpp b/redfish-core/lib/task.hpp
index b1b1d22..dcad059 100644
--- a/redfish-core/lib/task.hpp
+++ b/redfish-core/lib/task.hpp
@@ -39,7 +39,7 @@
 
 struct Payload
 {
-    Payload(const crow::Request& req) :
+    explicit Payload(const crow::Request& req) :
         targetUri(req.url), httpOperation(req.methodString()),
         httpHeaders(nlohmann::json::array())