diff --git a/pkg/config/app.go b/pkg/config/app.go
index 15704055e..a9f22d758 100644
--- a/pkg/config/app.go
+++ b/pkg/config/app.go
@@ -49,7 +49,9 @@ func (a App) StackName() string {
 	if _, exists := a.Env["STACK_NAME"]; exists {
 		return a.Env["STACK_NAME"]
 	}
-	return SanitiseAppName(a.Name)
+	stackName := SanitiseAppName(a.Name)
+	a.Env["STACK_NAME"] = stackName
+	return stackName
 }
 
 // SORTING TYPES