diff --git a/src/base/net/tools/MemPool.h b/src/base/net/tools/MemPool.h
index 3b8a8ef41..a462a49f0 100644
--- a/src/base/net/tools/MemPool.h
+++ b/src/base/net/tools/MemPool.h
@@ -24,6 +24,7 @@
 #include <set>
 #include <array>
 #include <cassert>
+#include <cstddef>
 
 
 namespace xmrig {