diff --git a/bundle/bundle.go b/bundle/bundle.go
index 3c2568a7..efcf7bbc 100644
--- a/bundle/bundle.go
+++ b/bundle/bundle.go
@@ -81,7 +81,7 @@ type LocationRef struct {
 type BaseImage struct {
 	ImageType string            `json:"imageType" yaml:"imageType"`
 	Image     string            `json:"image" yaml:"image"`
-	Digest    string            `json:"contentDigest,omitempty" yaml:"contentDigest"`
+	Digest    string            `json:"contentDigest,omitempty" yaml:"contentDigest,omitempty"`
 	Size      uint64            `json:"size,omitempty" yaml:"size,omitempty"`
 	Labels    map[string]string `json:"labels,omitempty" yaml:"labels,omitempty"`
 	MediaType string            `json:"mediaType,omitempty" yaml:"mediaType,omitempty"`
diff --git a/testdata/bundles/bundle.yaml b/testdata/bundles/bundle.yaml
index 6567210e..91c88908 100644
--- a/testdata/bundles/bundle.yaml
+++ b/testdata/bundles/bundle.yaml
@@ -5,14 +5,12 @@ description: something
 invocationImages:
 - imageType: docker
   image: deislabs/invocation-image:1.0
-  contentDigest: ""
   labels:
     os: Linux
 images:
   server:
     imageType: docker
     image: nginx:1.0
-    contentDigest: ""
     description: complicated
 parameters:
   enabled: