diff --git a/src/mt_rng.cpp b/src/mt_rng.cpp
index f61d8a2118d..ea91f1be61a 100644
--- a/src/mt_rng.cpp
+++ b/src/mt_rng.cpp
@@ -15,6 +15,7 @@
 #include "mt_rng.hpp"
 #include "seed_rng.hpp"
 #include "config.hpp"
+#include "formatter.hpp"
 #include "log.hpp"
 #include <sstream>
 #include <iomanip>
@@ -71,8 +72,8 @@ void mt_rng::seed_random(const uint32_t seed, const unsigned int call_count)
 	random_seed_ = seed;
 	mt_.seed(random_seed_);
 	discard(call_count); //mt_.discard(call_count);
-	DBG_RND << "Seeded random with " << std::hex << random_seed_ << " with "
-		<< random_calls_ << " calls." << std::endl;
+	DBG_RND << (formatter() << "Seeded random with " << std::hex << random_seed_ << " with "
+		<< random_calls_ << " calls.").str() << std::endl;
 }
 
 void mt_rng::seed_random(const std::string & seed_str, const unsigned int call_count)