diff --git a/src/net/JobResults.h b/src/net/JobResults.h
index 576e7219..4d16d27b 100644
--- a/src/net/JobResults.h
+++ b/src/net/JobResults.h
@@ -27,6 +27,7 @@
 #define XMRIG_JOBRESULTS_H
 
 
+#include <cstddef>
 #include <cstdint>