diff --git a/CellframeNodeDiagtool/WinDiagnostic.cpp b/CellframeNodeDiagtool/WinDiagnostic.cpp
index 47b652acfc9eb0320436879313fff36c3134f143..a1430322b69db00576155448376774beb5921fe6 100644
--- a/CellframeNodeDiagtool/WinDiagnostic.cpp
+++ b/CellframeNodeDiagtool/WinDiagnostic.cpp
@@ -4,6 +4,7 @@
 #include "registry.h"
 #include <pdh.h>
 #include <windows.h>
+#include <tlhelp32.h>
 
 WinDiagnostic::WinDiagnostic(AbstractDiagnostic *parent)
     : AbstractDiagnostic{parent}