diff --git a/src/detail/probe-encoder.hpp b/src/detail/probe-encoder.hpp
index 2b63cc1..bde8a87 100644
--- a/src/detail/probe-encoder.hpp
+++ b/src/detail/probe-encoder.hpp
@@ -29,7 +29,7 @@
 
 // For Client use
 Block
-encodeApplicationParameters(std::multimap<std::string, std::string>&& parameters);
+encodeApplicationParameters(const std::multimap<std::string, std::string>& parameters);
 
 void
 decodeDataContent(const Block& block, std::vector<std::pair<Name, int>>& availableNames,