diff --git a/declarations/mapillary.js.flow b/declarations/mapillary.js.flow
index 27e9735c..7f16e180 100644
--- a/declarations/mapillary.js.flow
+++ b/declarations/mapillary.js.flow
@@ -1167,7 +1167,7 @@ export type CameraParameters = {
   ...
 };
 export type CameraUniforms = {
-  [key: string]: boolean | number | number[],
+  +[key: string]: boolean | number | number[],
   ...
 };