diff --git a/attn/pel/pel_minimal.hpp b/attn/pel/pel_minimal.hpp
index cde0ead..79c0c11 100644
--- a/attn/pel/pel_minimal.hpp
+++ b/attn/pel/pel_minimal.hpp
@@ -46,7 +46,7 @@
      *
      * @param[in] pelBuffer - buffer containing a raw PEL
      */
-    PelMinimal(std::vector<uint8_t>& data);
+    explicit PelMinimal(std::vector<uint8_t>& data);
 
     /**
      * @brief Stream raw PEL data to buffer