diff --git a/extensions/openpower-pels/pel.hpp b/extensions/openpower-pels/pel.hpp
index 631cbdb..460d588 100644
--- a/extensions/openpower-pels/pel.hpp
+++ b/extensions/openpower-pels/pel.hpp
@@ -80,7 +80,7 @@
      *
      * @param[in] data - The PEL data
      */
-    PEL(std::vector<uint8_t>& data);
+    explicit PEL(std::vector<uint8_t>& data);
 
     /**
      * @brief Constructor