diff --git a/phosphor-regulators/src/device.hpp b/phosphor-regulators/src/device.hpp
index fd5d844..5f443b5 100644
--- a/phosphor-regulators/src/device.hpp
+++ b/phosphor-regulators/src/device.hpp
@@ -45,7 +45,7 @@
      *
      * @param id unique device ID
      */
-    Device(const std::string& id) : id{id}
+    explicit Device(const std::string& id) : id{id}
     {
     }
 
diff --git a/phosphor-regulators/src/rail.hpp b/phosphor-regulators/src/rail.hpp
index f825863..d5d3b13 100644
--- a/phosphor-regulators/src/rail.hpp
+++ b/phosphor-regulators/src/rail.hpp
@@ -48,7 +48,7 @@
      *
      * @param id unique rail ID
      */
-    Rail(const std::string& id) : id{id}
+    explicit Rail(const std::string& id) : id{id}
     {
     }
 
diff --git a/phosphor-regulators/src/rule.hpp b/phosphor-regulators/src/rule.hpp
index 25be1e9..3fb21a6 100644
--- a/phosphor-regulators/src/rule.hpp
+++ b/phosphor-regulators/src/rule.hpp
@@ -52,7 +52,7 @@
      *
      * @param id unique rule ID
      */
-    Rule(const std::string& id) : id{id}
+    explicit Rule(const std::string& id) : id{id}
     {
     }