diff --git a/src/yaml/updateLayerMetadata.yaml b/src/yaml/updateLayerMetadata.yaml
index 4c0f687..928e5ff 100644
--- a/src/yaml/updateLayerMetadata.yaml
+++ b/src/yaml/updateLayerMetadata.yaml
@@ -123,7 +123,7 @@ components:
           $ref: geojson.yaml#/components/schemas/FeatureCollection
         productBoundingBox:
           type: string
-          pattern: "^(0|[1-9]\\d*)(\\.\\d*)?,(0|[1-9]\\d*)(\\.\\d*)?,(0|[1-9]\\d*)(\\.\\d*)?,(0|[1-9]\\d*)(\\.\\d*)?$"
+          pattern: "^-?(0|[1-9]\\d*)(\\.\\d*)?,-?(0|[1-9]\\d*)(\\.\\d*)?,-?(0|[1-9]\\d*)(\\.\\d*)?,-?(0|[1-9]\\d*)(\\.\\d*)?$"
           
     updateStatusLayerMetadata:
       type: object