diff --git a/src/hw/api/HwApi.h b/src/hw/api/HwApi.h
index f434a0a5..9de8dfd5 100644
--- a/src/hw/api/HwApi.h
+++ b/src/hw/api/HwApi.h
@@ -29,7 +29,7 @@
 namespace xmrig {
 
 
-struct DmiReader;
+class DmiReader;
 
 
 class HwApi : public IApiListener