diff --git a/autogpt_platform/backend/backend/blocks/ai_image_customizer.py b/autogpt_platform/backend/backend/blocks/ai_image_customizer.py
index 4d87f1e41d..1c40f925c3 100644
--- a/autogpt_platform/backend/backend/blocks/ai_image_customizer.py
+++ b/autogpt_platform/backend/backend/blocks/ai_image_customizer.py
@@ -64,6 +64,10 @@ class AIImageCustomizerBlock(Block):
             description="List of input images (optional)",
             default=None,
             title="Images",
+            json_schema_extra={
+                "type": "array",
+                "items": {"type": "string", "format": "uri"},
+            },
         )
         output_format: OutputFormat = SchemaField(
             description="Format of the output image",