diff --git a/reactos/dll/win32/uxtheme/themehooks.c b/reactos/dll/win32/uxtheme/themehooks.c
index 6ce8cb76d8a..20b541dbf8f 100644
--- a/reactos/dll/win32/uxtheme/themehooks.c
+++ b/reactos/dll/win32/uxtheme/themehooks.c
@@ -399,4 +399,44 @@ ThemeHooksRemove()
     UXTHEME_broadcast_msg (NULL, WM_THEMECHANGED);
 
     return ret;
-}
\ No newline at end of file
+}
+
+INT WINAPI ClassicSystemParametersInfoW(UINT uiAction, UINT uiParam, PVOID pvParam, UINT fWinIni)
+{
+    if (gbThemeHooksActive)
+    {
+        return user32ApiHook.SystemParametersInfoW(uiAction, uiParam, pvParam, fWinIni);
+    }
+
+    return SystemParametersInfoW(uiAction, uiParam, pvParam, fWinIni);
+}
+
+INT WINAPI ClassicSystemParametersInfoA(UINT uiAction, UINT uiParam, PVOID pvParam, UINT fWinIni)
+{
+    if (gbThemeHooksActive)
+    {
+        return user32ApiHook.SystemParametersInfoA(uiAction, uiParam, pvParam, fWinIni);
+    }
+
+    return SystemParametersInfoA(uiAction, uiParam, pvParam, fWinIni);
+}
+
+INT WINAPI ClassicGetSystemMetrics(int nIndex)
+{
+    if (gbThemeHooksActive)
+    {
+        return user32ApiHook.GetSystemMetrics(nIndex);
+    }
+
+    return GetSystemMetrics(nIndex);
+}
+
+BOOL WINAPI ClassicAdjustWindowRectEx(LPRECT lpRect, DWORD dwStyle, BOOL bMenu, DWORD dwExStyle)
+{
+    if (gbThemeHooksActive)
+    {
+        return user32ApiHook.AdjustWindowRectEx(lpRect, dwStyle, bMenu, dwExStyle);
+    }
+
+    return AdjustWindowRectEx(lpRect, dwStyle, bMenu, dwExStyle);
+}
diff --git a/reactos/dll/win32/uxtheme/uxtheme.spec b/reactos/dll/win32/uxtheme/uxtheme.spec
index 7dcc59a5f90..632cfe84a00 100644
--- a/reactos/dll/win32/uxtheme/uxtheme.spec
+++ b/reactos/dll/win32/uxtheme/uxtheme.spec
@@ -40,10 +40,10 @@
 40 stdcall EnableThemeDialogTexture(ptr long)
 41 stdcall EnableTheming(long)
 42 stdcall GetCurrentThemeName(wstr long wstr long wstr long)
-43 stub -noname ClassicGetSystemMetrics
-44 stub -noname ClassicSystemParametersInfoA
-45 stub -noname ClassicSystemParametersInfoW
-46 stub -noname ClassicAdjustWindowRectEx
+43 stdcall -noname ClassicGetSystemMetrics(long)
+44 stdcall -noname ClassicSystemParametersInfoA(long long ptr long)
+45 stdcall -noname ClassicSystemParametersInfoW(long long ptr long)
+46 stdcall -noname ClassicAdjustWindowRectEx(ptr long long long)
 47 stdcall DrawThemeBackgroundEx(ptr ptr long long ptr ptr)
 48 stub -noname GetThemeParseErrorInfo
 49 stdcall GetThemeAppProperties()