diff --git a/api-ref/source/v1/parameters.yaml b/api-ref/source/v1/parameters.yaml
index d7d6b79c1f..aec388b369 100644
--- a/api-ref/source/v1/parameters.yaml
+++ b/api-ref/source/v1/parameters.yaml
@@ -1409,7 +1409,7 @@ stack_tags:
     The stack tags.
   in: body
   required: true
-  type: string
+  type: array
 stack_template:
   description: |
     The template used to create the stack.