diff --git a/modules/container_app/variables.tf b/modules/container_app/variables.tf
index 0b32e2f..1dc8e9c 100644
--- a/modules/container_app/variables.tf
+++ b/modules/container_app/variables.tf
@@ -142,7 +142,7 @@ variable "volume" {
   default = []
   type = list(object({
     name = string
-    storage_name = string
-    storage_type = string
+    storage_name = optional(string)
+    storage_type = optional(string)
   }))
 }
\ No newline at end of file