diff --git a/src/cfglr_nvs.c b/src/cfglr_nvs.c
index 08d6d93..f53bba5 100644
--- a/src/cfglr_nvs.c
+++ b/src/cfglr_nvs.c
@@ -52,7 +52,7 @@ uint16_t cfglr_backend_nvs_get(cfglr_backend_t *backend, cfglr_element_t *elemen
 
     case CFGLR_DATATYPE_STR:
     case CFGLR_DATATYPE_BIN:
-      uint8_t read_size = 0;
+      size_t read_size = 0;
 
       err = nvs_get_blob((nvs_handle_t)backend->handle, element->key, element->data, &read_size);