diff --git a/sys/winnt/win10.c b/sys/winnt/win10.c
index d1332260c..abf76d9eb 100644
--- a/sys/winnt/win10.c
+++ b/sys/winnt/win10.c
@@ -9,6 +9,21 @@
 
 #include "hack.h"
 
+typedef DPI_AWARENESS_CONTEXT(WINAPI *GetThreadDpiAwarenessContextProc)(VOID);
+typedef BOOL(WINAPI *AreDpiAwarenessContextsEqualProc)(
+    DPI_AWARENESS_CONTEXT dpiContextA, DPI_AWARENESS_CONTEXT dpiContextB);
+typedef UINT(WINAPI *GetDpiForWindowProc)(HWND hwnd);
+typedef LONG (WINAPI *GetCurrentPackageFullNameProc)(UINT32 *packageFullNameLength,
+    PWSTR  packageFullName);
+
+typedef struct {
+    BOOL Valid;
+    GetThreadDpiAwarenessContextProc GetThreadDpiAwarenessContext;
+    AreDpiAwarenessContextsEqualProc AreDpiAwarenessContextsEqual;
+    GetDpiForWindowProc GetDpiForWindow;
+    GetCurrentPackageFullNameProc GetCurrentPackageFullName;
+} Win10;
+
 Win10 gWin10 = { 0 };
 
 void win10_init()
diff --git a/sys/winnt/win10.h b/sys/winnt/win10.h
index 4ba834995..bbb0ca9a3 100644
--- a/sys/winnt/win10.h
+++ b/sys/winnt/win10.h
@@ -7,21 +7,6 @@
 
 #include "win32api.h"
 
-typedef DPI_AWARENESS_CONTEXT(WINAPI *GetThreadDpiAwarenessContextProc)(VOID);
-typedef BOOL(WINAPI *AreDpiAwarenessContextsEqualProc)(
-    DPI_AWARENESS_CONTEXT dpiContextA, DPI_AWARENESS_CONTEXT dpiContextB);
-typedef UINT(WINAPI *GetDpiForWindowProc)(HWND hwnd);
-typedef LONG (WINAPI *GetCurrentPackageFullNameProc)(UINT32 *packageFullNameLength,
-    PWSTR  packageFullName);
-
-typedef struct {
-    BOOL Valid;
-    GetThreadDpiAwarenessContextProc GetThreadDpiAwarenessContext;
-    AreDpiAwarenessContextsEqualProc AreDpiAwarenessContextsEqual;
-    GetDpiForWindowProc GetDpiForWindow;
-    GetCurrentPackageFullNameProc GetCurrentPackageFullName;
-} Win10;
-
 typedef struct {
     double  scale;  // dpi of monitor / 96
     int     width;  // in pixels
@@ -30,12 +15,9 @@ typedef struct {
     int     left; // in desktop coordinate pixel space
 } MonitorInfo;
 
-extern Win10 gWin10;
-
 void win10_init();
 int win10_monitor_dpi(HWND hWnd);
 double win10_monitor_scale(HWND hWnd);
-void win10_monitor_size(HWND hWnd, int * width, int * height);
 void win10_monitor_info(HWND hWnd, MonitorInfo * monitorInfo);
 BOOL win10_is_desktop_bridge_application(void);