diff --git a/post-processor/vagrant/libvirt.go b/post-processor/vagrant/libvirt.go
index bb19b2d176c..087afc3451a 100644
--- a/post-processor/vagrant/libvirt.go
+++ b/post-processor/vagrant/libvirt.go
@@ -5,6 +5,7 @@ import (
 	"github.com/mitchellh/packer/packer"
 	"path/filepath"
 	"strings"
+	"math"
 )
 
 type LibVirtProvider struct{}
@@ -22,7 +23,8 @@ func (p *LibVirtProvider) Process(ui packer.Ui, artifact packer.Artifact, dir st
 	}
 
 	format := artifact.State("diskType").(string)
-	size := artifact.State("diskSize").(uint) / 1024 // In MB, want GB
+	// Round size up to nearest GB
+	size := math.Ceil(float64(artifact.State("diskSize").(uint)) / float64(1024))
 	domainType := artifact.State("domainType").(string)
 
 	// Convert domain type to libvirt driver