diff --git a/apify-api/openapi/paths/datasets/datasets@{datasetId}@items.yaml b/apify-api/openapi/paths/datasets/datasets@{datasetId}@items.yaml
index 3d6f8e628d..0881d8c762 100644
--- a/apify-api/openapi/paths/datasets/datasets@{datasetId}@items.yaml
+++ b/apify-api/openapi/paths/datasets/datasets@{datasetId}@items.yaml
@@ -371,7 +371,7 @@ get:
       in: query
       description: Signature used to access the items.
       required: false
-      style: simple
+      style: form
       schema:
         type: string
         example: 2wTI46Bg8qWQrV7tavlPI
diff --git a/apify-api/openapi/paths/key-value-stores/key-value-stores@{storeId}@keys.yaml b/apify-api/openapi/paths/key-value-stores/key-value-stores@{storeId}@keys.yaml
index 026bd536f6..9e7a9060e8 100644
--- a/apify-api/openapi/paths/key-value-stores/key-value-stores@{storeId}@keys.yaml
+++ b/apify-api/openapi/paths/key-value-stores/key-value-stores@{storeId}@keys.yaml
@@ -51,7 +51,7 @@ get:
       in: query
       description: Signature used to access the keys.
       required: false
-      style: simple
+      style: form
       schema:
         type: string
         example: 2wTI46Bg8qWQrV7tavlPI
diff --git a/apify-api/openapi/paths/key-value-stores/key-value-stores@{storeId}@records@{recordKey}.yaml b/apify-api/openapi/paths/key-value-stores/key-value-stores@{storeId}@records@{recordKey}.yaml
index 352b38c996..28c2eb3f37 100644
--- a/apify-api/openapi/paths/key-value-stores/key-value-stores@{storeId}@records@{recordKey}.yaml
+++ b/apify-api/openapi/paths/key-value-stores/key-value-stores@{storeId}@records@{recordKey}.yaml
@@ -40,7 +40,7 @@ get:
       in: query
       description: Signature used to access the record.
       required: false
-      style: simple
+      style: form
       schema:
         type: string
         example: 2wTI46Bg8qWQrV7tavlPI