diff --git a/ui/cocoa.m b/ui/cocoa.m
index f20fd1ffa20e14e3f609c43e57132ecfa8608c7f..a270a464d8c134424e748bf98fec77978a3c03cd 100644
--- a/ui/cocoa.m
+++ b/ui/cocoa.m
@@ -404,7 +404,11 @@ QemuCocoaView *cocoaView;
 
     int w = surface_width(surface);
     int h = surface_height(surface);
-    bool isResize = (w != screen.width || h != screen.height);
+    /* cdx == 0 means this is our very first surface, in which case we need
+     * to recalculate the content dimensions even if it happens to be the size
+     * of the initial empty window.
+     */
+    bool isResize = (w != screen.width || h != screen.height || cdx == 0.0);
 
     int oldh = screen.height;
     if (isResize) {