diff --git a/tools/Makefile.am b/tools/Makefile.am
index 0bb6c2c..61d2907 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -13,4 +13,5 @@
 	lpc.cpp \
 	blob_handler.cpp \
 	ipmi_handler.cpp \
-	crc.cpp
+	crc.cpp \
+	../internal/sys.cpp
diff --git a/tools/ipmi_handler.hpp b/tools/ipmi_handler.hpp
index 144fc22..eec0c87 100644
--- a/tools/ipmi_handler.hpp
+++ b/tools/ipmi_handler.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "internal/sys.hpp"
 #include "ipmi_interface.hpp"
 
 namespace host_tool
@@ -8,10 +9,14 @@
 class IpmiHandler : public IpmiInterface
 {
   public:
-    IpmiHandler() = default;
+    explicit IpmiHandler(const internal::Sys* sys = &internal::sys_impl) :
+        sys(sys){};
 
     std::vector<std::uint8_t>
         sendPacket(const std::vector<std::uint8_t>& data) override;
+
+  private:
+    const internal::Sys* sys;
 };
 
 } // namespace host_tool