diff --git a/backends/imgui_impl_win32.cpp b/backends/imgui_impl_win32.cpp
index dc7e66f02..b1d715436 100644
--- a/backends/imgui_impl_win32.cpp
+++ b/backends/imgui_impl_win32.cpp
@@ -784,7 +784,7 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandlerEx(HWND hwnd, UINT msg, WPA
         else
         {
             wchar_t wch = 0;
-            ::MultiByteToWideChar(bd->KeyboardCodePage, MB_PRECOMPOSED, (char*)&wParam, 1, &wch, 1);
+            ::MultiByteToWideChar(bd->KeyboardCodePage, MB_PRECOMPOSED, (char*)&wParam, 2, &wch, 1);
             io.AddInputCharacter(wch);
         }
         return 0;