diff --git a/src/util/system.h b/src/util/system.h
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -356,9 +356,9 @@
                            const std::string &message);
 
 /**
- * Return the number of physical cores available on the current system.
- * @note This does not count virtual cores, such as those provided by
- * HyperThreading when boost is newer than 1.56.
+ * Return the number of cores available on the current system.
+ * @note This does count virtual cores, such as those provided by
+ * HyperThreading.
  */
 int GetNumCores();
 
diff --git a/src/util/system.cpp b/src/util/system.cpp
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -21,6 +21,7 @@
 
 #include <cstdarg>
 #include <memory>
+#include <thread>
 
 #if (defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__))
 #include <pthread.h>
@@ -1350,7 +1351,7 @@
 }
 
 int GetNumCores() {
-    return boost::thread::physical_concurrency();
+    return std::thread::hardware_concurrency();
 }
 
 std::string CopyrightHolders(const std::string &strPrefix) {