diff --git a/src/Global/FanyDefines.h b/src/Global/FanyDefines.h
index acd1b4ff..8d11e290 100644
--- a/src/Global/FanyDefines.h
+++ b/src/Global/FanyDefines.h
@@ -1,10 +1,12 @@
 #pragma once
 #include <string>
 #include <unordered_set>
+#include <Windows.h>
 
 namespace Global
 {
 inline std::wstring ZEN_BROWSER = L"zen.exe";
 // inline std::unordered_set<std::wstring> VSCodeSeries = {L"Code.exe", L"Code - Insiders.exe", L"VSCodium.exe"};
 // inline bool IsVSCodeLike = false;
+inline LONG INVALID_Y = -100000;
 } // namespace Global
\ No newline at end of file
diff --git a/src/Tf/TfTextLayoutSink.cpp b/src/Tf/TfTextLayoutSink.cpp
index 55f78b8c..767407f9 100644
--- a/src/Tf/TfTextLayoutSink.cpp
+++ b/src/Tf/TfTextLayoutSink.cpp
@@ -1,3 +1,4 @@
+#include "FanyDefines.h"
 #include "Private.h"
 #include "TfTextLayoutSink.h"
 #include "MetasequoiaIME.h"
@@ -216,7 +217,7 @@ HRESULT CTfTextLayoutSink::_GetTextExt(_Out_ RECT *lpRect)
 #endif
         // Set default value to make sure the window is hidden by moving it out of the screen
         lpRect->left = 0;
-        lpRect->bottom = -1000;
+        lpRect->bottom = Global::INVALID_Y;
     }
 #ifdef FANY_DEBUG
     // TODO: Log lpRect position