diff --git a/src/params.cpp b/src/params.cpp
index d865f7f..5d2b9e5 100644
--- a/src/params.cpp
+++ b/src/params.cpp
@@ -255,7 +255,7 @@ Params::Params(const std::vector<std::vector<std::string>>& args)
 #endif
 
 		if ((arg[0] == "merge-mine") && has1(arg) && has2(arg)) {
-			m_mergeMiningHosts.emplace_back(arg[1], arg[2]);
+			m_mergeMiningHosts.emplace_back(arg[1].c_str(), arg[2].c_str());
 			ok = true;
 		}