diff --git a/src/detection/displayserver/displayserver_apple.c b/src/detection/displayserver/displayserver_apple.c
index e40d25116..8f5ea3e3c 100644
--- a/src/detection/displayserver/displayserver_apple.c
+++ b/src/detection/displayserver/displayserver_apple.c
@@ -108,7 +108,7 @@ static void detectDisplays(FFDisplayServerResult* ds)
                 }
             }
 
-            if (!physicalWidth || !physicalHeight)
+            if ((!physicalWidth || !physicalHeight) && CGDisplayPrimaryDisplay(screen) == screen) // #1406
             {
                 CGSize size = CGDisplayScreenSize(screen);
                 physicalWidth = (uint32_t) (size.width + 0.5);