diff --git a/src/workers/Workers.cpp b/src/workers/Workers.cpp
index 4564bec81..7e58548cd 100644
--- a/src/workers/Workers.cpp
+++ b/src/workers/Workers.cpp
@@ -25,6 +25,7 @@
 #include <cmath>
 #include <inttypes.h>
 #include <thread>
+#include <string> // for MSVS std::to_string
 
 
 #include "api/Api.h"