diff --git a/doc/gitian-building.md b/doc/gitian-building.md
index 7796a5fc9c..938f92ff12 100644
--- a/doc/gitian-building.md
+++ b/doc/gitian-building.md
@@ -55,7 +55,7 @@ In the VirtualBox GUI click "New" and choose the following parameters in the wiz
 
 ![](gitian-building/create_vm_memsize.png)
 
-- Memory Size: at least 1024MB, anything less will really slow down the build.
+- Memory Size: at least 3000MB, anything less and the build might not complete.
 
 ![](gitian-building/create_vm_hard_disk.png)
 
diff --git a/doc/gitian-building/create_vm_memsize.png b/doc/gitian-building/create_vm_memsize.png
index 5abfee5337..6f42cda73f 100644
Binary files a/doc/gitian-building/create_vm_memsize.png and b/doc/gitian-building/create_vm_memsize.png differ