diff --git a/imgui.cpp b/imgui.cpp
index 97bbe203c..b868d93be 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -16220,10 +16220,7 @@ ImGuiViewportP* ImGui::AddUpdateViewport(ImGuiWindow* window, ImGuiID id, const
 
         // Store initial DpiScale before the OS platform window creation, based on expected monitor data.
         // This is so we can select an appropriate font size on the first frame of our window lifetime
-        if (viewport->PlatformMonitor != -1)
-            viewport->DpiScale = g.PlatformIO.Monitors[viewport->PlatformMonitor].DpiScale;
-        else
-            viewport->DpiScale = 1.0f;
+        viewport->DpiScale = GetViewportPlatformMonitor(viewport)->DpiScale;
     }
 
     viewport->Window = window;