diff --git a/pkg/cmd/pulumi/stack_ls_test.go b/pkg/cmd/pulumi/stack_ls_test.go
index 42c3a1dabd54..85f94f8a4933 100644
--- a/pkg/cmd/pulumi/stack_ls_test.go
+++ b/pkg/cmd/pulumi/stack_ls_test.go
@@ -82,6 +82,10 @@ func (msr *mockStackReference) Name() tokens.Name {
 	return tokens.Name(msr.name)
 }
 
+func (msr *mockStackReference) FullyQualifiedName() tokens.Name {
+	return msr.Name()
+}
+
 func (msr *mockStackReference) String() string {
 	return msr.name
 }