diff --git a/gdk/quartz/GdkQuartzNSWindow.c b/gdk/quartz/GdkQuartzNSWindow.c
index 5a546891aa..6a3d2919c1 100644
--- a/gdk/quartz/GdkQuartzNSWindow.c
+++ b/gdk/quartz/GdkQuartzNSWindow.c
@@ -245,7 +245,10 @@
   window->height = content_rect.size.height;
 
   if(window->width % align)
-    content_rect.size.width += align - window->width % align;
+    {
+      window->width += align - window->width % align;
+      content_rect.size.width = window->width;
+    }
 
   content_rect.origin.x = 0;
   content_rect.origin.y = 0;