diff --git a/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java b/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
index 273a9b3..eca4230 100644
--- a/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
+++ b/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
@@ -52,7 +52,7 @@
     @Path("/{aid}/pageMap/0/layers/0/strokes")
     @POST
     @Produces(MediaType.APPLICATION_JSON)
-    public Integer addStrokes(@PathParam("aid") Integer aid, @FormParam("uid") Integer uid, @FormParam("uidToken") Integer uidToken,
+    public Integer addStrokes(@PathParam("aid") Integer aid, @FormParam("uid") Integer uid, @FormParam("uidToken") String uidToken,
                              @FormParam("pen") Integer pen, @FormParam("color") Integer color, @FormParam("thick") Integer thick) {
         var animation = gallery.getAnimationInformation(aid);