diff --git a/pkg/config/app.go b/pkg/config/app.go
index b246f47c9..c9143bd07 100644
--- a/pkg/config/app.go
+++ b/pkg/config/app.go
@@ -46,7 +46,7 @@ type App struct {
 
 // StackName gets what the docker safe stack name is for the app
 func (a App) StackName() string {
-	if a.Env["STACK_NAME"] != "" {
+	if _, exists := a.Env["STACK_NAME"]; exists {
 		return a.Env["STACK_NAME"]
 	}
 	return SanitiseAppName(a.Name)