diff --git a/pkg/orca/env.go b/pkg/orca/env.go
index 4043f2d..7f10e00 100644
--- a/pkg/orca/env.go
+++ b/pkg/orca/env.go
@@ -506,7 +506,7 @@ func NewDiffEnvCmd(out io.Writer) *cobra.Command {
 	f.StringVar(&e.nameRight, "name-right", os.Getenv("ORCA_NAME_RIGHT"), "name of right environment to compare. Overrides $ORCA_NAME_RIGHT")
 	f.StringVar(&e.kubeContextLeft, "kube-context-left", os.Getenv("ORCA_KUBE_CONTEXT_LEFT"), "name of the left kubeconfig context to use. Overrides $ORCA_KUBE_CONTEXT_LEFT")
 	f.StringVar(&e.kubeContextRight, "kube-context-right", os.Getenv("ORCA_KUBE_CONTEXT_RIGHT"), "name of the right kubeconfig context to use. Overrides $ORCA_KUBE_CONTEXT_RIGHT")
-	f.StringVarP(&e.output, "output", "o", os.Getenv("ORCA_OUTPUT"), "output format (yaml, md, table). Overrides $ORCA_OUTPUT")
+	f.StringVarP(&e.output, "output", "o", utils.GetStringEnvVar("ORCA_OUTPUT", "yaml"), "output format (yaml, table). Overrides $ORCA_OUTPUT")
 
 	return cmd
 }
diff --git a/pkg/utils/chart.go b/pkg/utils/chart.go
index 87da00f..dce2eee 100644
--- a/pkg/utils/chart.go
+++ b/pkg/utils/chart.go
@@ -359,7 +359,7 @@ func PrintDiff(o DiffOptions) {
 	case "table":
 		printDiffTable(o, diffs)
 	case "":
-		printDiffTable(o, diffs)
+		printDiffYaml(diffs)
 	}
 
 }