diff --git a/hw/kdrive/fbdev/fbdev.c b/hw/kdrive/fbdev/fbdev.c
index fb6e3a292..fd14afa92 100644
--- a/hw/kdrive/fbdev/fbdev.c
+++ b/hw/kdrive/fbdev/fbdev.c
@@ -465,6 +465,16 @@ fbdevRandRSetConfig(ScreenPtr pScreen,
     int oldheight;
     int oldmmwidth;
     int oldmmheight;
+    int newwidth, newheight;
+
+    if (screen->randr & (RR_Rotate_0 | RR_Rotate_180)) {
+        newwidth = pSize->width;
+        newheight = pSize->height;
+    }
+    else {
+        newwidth = pSize->height;
+        newheight = pSize->width;
+    }
 
     if (wasEnabled)
         KdDisableScreen(pScreen);